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pirotte Neuro
comp test #2
472
Other
Not Applicable
09/29/2005

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Term
what is the neocortex?
Definition
90 percent of cortex, primary cortex of humans
Term
what is the paleocortex?
Definition
piriform lobe, includes 1ary and 2ary olfactory area
Term
what is the archicortex?
Definition
hippocampal formation, recent memory and spatial memory
Term
how many layers in the cortex?
Definition
6
Term
connections of layers I-III of cortex?
Definition
intracortical, intercortical which lends itself to higher associative fxns
Term
connections of layer IV of cortex?
Definition
thalamocortical, ventral tier thalamic nuclei, geniculate nuclei
Term
projection of layer V of cortex?
Definition
cortico- fibers minus corticothalamic
Term
projection of layer VI of cortex?
Definition
corticothalamic fibers
Term
where do pyramidal cells predominate?
Definition
II, III, V, VI
Term
where do granule cells predominate?
Definition
IV
Term
what gyrus comprises the 1somatosensory cortex?
Definition
postcentral gyrus of parietal lobe
Term
what is the Brodmanns of the 1somatosensory cortex?
Definition
312
Term
what thalamic nuclei project to SI?
Definition
VPL, VPM
Term
where do VPL and VPM project?
Definition
SI
Term
where is SII located?
Definition
caudal to SI on upper bank of sylvian canal
Term
where are the somatosensory association areas?
Definition
superior parietal lobe (5,7)
Term
what gyri comprises the prim vis cortex?
Definition
banks of calcarine fissure on medial surface of hemisphere
Term
what is the Brod of the prim vis cortex?
Definition
17
Term
what part of the visual field is on the upper bank of the prim vis cortex?
Definition
lower
Term
what thalamic nucleus projects to the vis cortex?
Definition
lat gen
Term
where does the lat gen n project?
Definition
visual cortex
Term
what gyrus comprises the auditory cortex?
Definition
sup temp gyrus, Heschl's gyrus
Term
what is the Brod area of the auditory cortex?
Definition
41
Term
where is the taste cortex?
Definition
inf end of postcentral gyrus
Term
where is the vestibular cortex?
Definition
parietal-insular
Term
what gyrus comprises the prim mot cortex?
Definition
precentral
Term
what is the Brod of the prim mot cortex?
Definition
4
Term
where is the premotor cortex?
Definition
anterior to prim motor
Term
what is the Brod of premotor cortex?
Definition
6
Term
where is the supp motor cortex?
Definition
medial hemisphere
Term
what is the Brod of the supp mortor cortex?
Definition
6
Term
where is the FEF?
Definition
rostral to premotor
Term
what is the Brod of FEF?
Definition
6
Term
what is the cingulum?
Definition
interconnects the parahippocampal gyrus, cingulate, medial frontal and parietal lobes
Term
what is the uncinate fasiculus?
Definition
connects orbital frontal gyri and ant temporal lobe
Term
what is the sup occipitofrontal fasciculus?
Definition
connects frontal/occipital poles
Term
what is the sup long fasciculus?
Definition
connects frontal, parietal, occipital, and temporal lobes
Term
what is the arctuate fasciculus?
Definition
sup long fasc
Term
what connects the orbital frontal gyri and the ant temporal lobes?
Definition
uncinate fasciculus
Term
what connects the parahippocampal gyrus, cingulate, medial frontal and parietal lobes?
Definition
cingulum
Term
what connects the frontal and occipital poles?
Definition
sup occipitofrontal fasc
Term
what connects the frontal, parietal, occipital, and temporal lobes?
Definition
sup long fasc/arctuate fasc
Term
waht does the ant commisure do?
Definition
connects the middle and inferior temporal gyri
Term
what is the internal capsule?
Definition
afferents and efferents from the CC compacting from the corona radiata
Term
where is the anterior limb of the internal capsule?
Definition
between the lentiform nucleus and the caudate
Term
where is the posterior limb of the internal capsule?
Definition
between the lentiform nucleus and the thalamus
Term
where is the genu of the internal capsule?
Definition
between A/P
Term
which hemisphere normally dominates for speech/language?
Definition
L
Term
what is agnosia?
Definition
the inability to recognize stimuli even in the prescense of primary inputs
Term
what are the intellectual signs of prefrontal damage?
Definition
inability to solve complex problems, decrease in abstract reasoning, lack of foresight
Term
what are the emotional signs of prefrontal damage?
Definition
apathy with R, euphoria with L, inconsiderate, rude, self-centered behavior
Term
fxn of frontal lobe
Definition
movement, language, attention, emotion
Term
fxn of parietal lobe
Definition
somatic sense, integration of somatosens, visual, auditory info
Term
fxn of occipital lobe
Definition
vision
Term
fxn of temporal lobe
Definition
hearing, language perception, memory
Term
what is in cortex layer 1?
Definition
mostly dendrites/axons
Term
what is in layer II and III of the cortex?
Definition
mostly pyramidal cells
Term
what is in layer V and VI of the cortex?
Definition
mostly pyramidal cells
Term
what is in layer IV of the cortex?
Definition
mostly granular cells
Term
what part of the cortex is associational?
Definition
supragranular
Term
what part of the cortex is sensory?
Definition
granular
Term
what part of the cortex is motor?
Definition
infraganular
Term
what does Brod 4,6 represent?
Definition
motor
Term
what does Brod 3,1,2 represetn?
Definition
somatosens
Term
what does Brod 17,18,19 represent?
Definition
visual
Term
what does Brod 41,42 represent?
Definition
auditory (think DMB #41)
Term
what does area 3a correspond to?
Definition
muscle spindles
Term
what does area 3b and 1 correspond to?
Definition
cutaneous afferents
Term
what does area 2 correspond to?
Definition
joint afferents
Term
what does a lesion of the post parietal cortex produce?
Definition
astereognosis, neglect if lesion in on R
Term
what can a lesion of the sec visual cortex cause?
Definition
inability to recognize familiar objects, prosopagnosia (faces)
Term
in the auditory cortex are low frequency areas found rostrally or caudally?
Definition
rostrally
Term
in the auditory cortex are high frequency areas found rostrally or caudally?
Definition
caudally
Term
what sort of lesion is found in Broca's aphasia?
Definition
post inf frontal lobe
Term
what is often comorbid with Broca's?
Definition
hemiparesis
Term
what is the lesion in Wernicke's aphasia?
Definition
post sup temporal lobe
Term
what is the lesion in conduction aphasia?
Definition
arctuate fasc
Term
how is fluency in Broca's?
Definition
non
Term
how is fluency in Wernicke's?
Definition
ok
Term
how is comprehension in Broca's?
Definition
ok
Term
how is comprehension in Wernike's?
Definition
poor
Term
how is fluency in conduction aphasia?
Definition
ok
Term
how is comprehension in conduction aphasia?
Definition
intermediate
Term
5 elements of normal gait
Definition
strength (UMN, LMN) Coordination (cerebellum) Posture (extrapyramid) Sensation (DCT) Memory/Concept
Term
ataxic gait indicates?
Definition
DCT/cerebellum
Term
hemiplegic gait indicates?
Definition
stroke?
Term
steppage gait indicates?
Definition
foot drop (peroneal n. vs L5)
Term
duck waddle indicates?
Definition
myopathy
Term
scissors gait indicates?
Definition
CST
Term
what is festination?
Definition
Park gait, leaning forward and then running to catch up
Term
what is Friedrich's ataxia?
Definition
a problem w/ the dorsal spinal cord
Term
what causes Friedrich's ataxia?
Definition
trinuc repeat
Term
resting tremor indicates?
Definition
park
Term
kinetic tremor indicates?
Definition
cerebellum
Term
what is athetosis?
Definition
slow, continual, writhing of limbs
Term
what is knocked out in Huntington's to produce chorea?
Definition
caudate
Term
what is hemiballismus?
Definition
rapid, violent flinging of proximal limbs
Term
what is dystonia?
Definition
continual contraction of muscles
Term
what is tic?
Definition
repetitive, semipurposeful, stereotyped movement
Term
what is myoclonus?
Definition
rapid, shocklike movements of the arms
Term
what is asterixis?
Definition
loss of postural tone of hands/feet
Term
how does one treat a Park temor?
Definition
antichol, L-dopa, DA-ags
Term
how does one treat an essential tremor?
Definition
B-blockers, barbs
Term
how does one treat choreoathetosis, ballismus, and tics?
Definition
DA-antags
Term
how does one treat dystonia?
Definition
antichol, benzos, botox
Term
sx assoc w/ lesion of frontal lobe
Definition
disinhibition, lack of concern, poor judgement, apathy, poor hygiene, imcontinence, sexual behavior, slowed/distractable fxn, frontal lobe release signs, gegenhalten
Term
sx assoc w/ lesion of the temporal lobe
Definition
B/L: amnesia (hippo), cortical deafness, Kluver-Bucy. dominant u/l: Wernicke's aphasia
Term
sx assoc w/ lesion of parietal lobe
Definition
sensory deficit, anosognosia, hemispat neglect, dressing/construction apraxia, Gerstmann's
Term
what causes Gerstmann's?
Definition
dominant parietal lobe lesion
Term
sx of Gerstmann's (4)?
Definition
agraphia, R-L problems, dyscalculia, finger agnosia
Term
sx assoc w/ lesion of the occipital lobe
Definition
B/L: denial of cortical blindness, visual agnosia U/L: color anomia
Term
what are the frontal lobe release signs?
Definition
suck/snout, root, grasp
Term
what is anosognosia?
Definition
pt unawareness of hemiparesis
Term
signs/sx of delirium
Definition
fluctuating attn, conc, motor activitiy; impairment of mem/lang/thinking/coord; mood change/halluc; motor signs
Term
eval of dementia
Definition
hx, focal neuro exam, neuropsych exam, imaging, blood/CSF
Term
gross path of Alz?
Definition
dec brain weight, gen atrophy of cortex, enlargement of ventricles
Term
histopath of Alz?
Definition
gliosis/neuron loss in subcortical nn: cholinergic n. basilis, NEergic LC, 5HTergic raphe midline
Term
rx for Alz (limited)
Definition
AChEi, NSAIDS, estrogen, sedative
Term
"memory circuit"
Definition
hippo-mamm-ant n.
Term
with what sort of lesion might you see perseveration?
Definition
frontal
Term
with what sort of lesion might you see agraphesthesia?
Definition
parietal
Term
diagnostic microscopic features of Alz
Definition
B-amyloid plaques, neurofibrillary tangles
Term
what causes optic atrophy?
Definition
loss of ganglion cell axons
Term
sudden visual loss + pain w/ EOM, optic disk appears swollen
Definition
optic neuritis (MS)
Term
field deficit assoc w/ pituitary tumor
Definition
initial b/l sup temp quantopsia, eventual ditemporal hemianopsia
Term
field deficit assoc w/ temporal lobe tumor
Definition
c/l superior homo quandrantopsia
Term
what might one conclude if the NB/DH test resulted in right nystagmus?
Definition
that the post ssc on that lowered side is "overly sensitive"
Term
conductive hearing loss hi/lo?
Definition
lo
Term
sensineural hearing loss hi/lo?
Definition
hi
Term
what is Meniere's disease?
Definition
membranous labyrinth swells and ruptures
Term
sx of Meniere's?
Definition
vertigo, tinnitus, deafness, nystagmus, ataxia
Term
what thalamic nucleus relays ML to cortex?
Definition
VPL
Term
what thalamic nucleus relays trigeminal inputs to cortex?
Definition
VMP
Term
where does the thalamic VP project to the cortex?
Definition
312
Term
what thalamic nucleus relays visual inputs to the cortex?
Definition
LG
Term
where does the thalamic LG project to the cortex?
Definition
17, primary visual
Term
what thalamic nucleus relays auditory inputs to the cortex?
Definition
MG
Term
where does the thalamic MG project to the cortex?
Definition
41, 42
Term
what thalamic nucleus relays cerebellar inputs to the cortex?
Definition
VA
Term
where does teh thalamic VA project to the cortex?
Definition
premot, suppmot = 6
Term
what thalamic nucleus projects to the lateral prefrontal cortex (eyes-head-attention)
Definition
MDI-ILN
Term
what thalamic nucleus projects to the medial orbital cortex (autonomic-emotion)?
Definition
MDm-MID
Term
what part of the cortex is eyes-head-attention?
Definition
lat prefront
Term
what part of the cortex is autonomic-emotion?
Definition
med orb
Term
what is the input to the MDI-ILN?
Definition
supp coll
Term
what is the input to the MDm-MID?
Definition
Sol n.
Term
what is the metathalamus?
Definition
MGLG
Term
general fxn of the thalamic VL
Definition
executing movements
Term
general fxn of the thalamic VA
Definition
planning movements
Term
general fxn of the thalamic LP
Definition
vision, eye movement
Term
general fxn of the thalamic PUL
Definition
vision, eye movement
Term
waht is the input to the thalamic ANT/LD?
Definition
hippo/mamm (mammilothalamic tract)
Term
components of the motor servo
Definition
gamma mn, spindles, alpha mn, tendon organs, muscles, load
Term
overall fxn of motor servo?
Definition
maintain muscle spindle
Term
which desc motor pathways preferentially control distal muscles of limbs?
Definition
latCST, RST
Term
what is the cause of spasticity?
Definition
loss of DLRtST
Term
strict def of spasticity?
Definition
a velocity dependant increase in resistance of a passively stretched muscle
Term
what nuclei comprise the basal ganglia
Definition
caudate, putamen, GP, substantia nigra, STN, amygdala, claustrum
Term
what do CAG repeats do to striatal cells?
Definition
cause apoptosis
Term
two primary sx of HD
Definition
chorea, dementia
Term
other name for BG?
Definition
extrapyramidal motor system
Term
fxn of ventral striatal basal ganglia system?
Definition
cognition, emotion
Term
components of the ventral striatal basal ganglia system?
Definition
n. accumbens (ventral striatum), ventral palladium, ventral tegmental area
Term
what projects from the VTA and where does it go?
Definition
mesolimbic DA to ventral striatum, mesocortical DA to frontal cortex
Term
effect of "direct" path on movement?
Definition
go
Term
effect of "indirect path on movement?
Definition
stop
Term
DAR in the direct pathway?
Definition
D1
Term
DAR in the indirect pathyway?
Definition
D2
Term
GP NT in the go pathway?
Definition
GABA, SP
Term
GP NT in the stop pathway?
Definition
GABA, ENK
Term
lesion in PD?
Definition
striatal neurons
Term
two routes from GP to thalamus
Definition
lenticular fasciculus, ansa lenticularis
Term
effect of large lesion in the STN?
Definition
hemiballismus
Term
striatal element of the dorsal striatal system?
Definition
caud, put
Term
striatal element of the ventral striatal system?
Definition
n. accumbens
Term
pallidal element of the dorsal striatal system?
Definition
SN
Term
pallidal element of the ventral striatal system?
Definition
VTA
Term
cortical input of the dorsal striatal system?
Definition
neo
Term
cortical input of the ventral striatal system?
Definition
limbic, hippo
Term
thalamic target of the dorsal striatal system?
Definition
VL-VA (motor stuff)
Term
thalamic target of the ventral striatal system?
Definition
MD (attention, emotion)
Term
cortical target of the dorsal striatal system?
Definition
motor
Term
cortical target of the ventral striatal system?
Definition
prefrontal
Term
what is the D2 receptor blocker used to treat schizo?
Definition
haldol
Term
what is the long term SE of the haldol?
Definition
tardive dyskinesia
Term
what structure is sometimes submitted to DBS to treat PD?
Definition
STN
Term
what is the anatomy of the bradykinesia in PD?
Definition
inc inhib output of GPm to the VL thalamic motor nucleus impairs stim of motor cortex
Term
what is the anatomy of hyperkinesic disorders in the basal ganglia?
Definition
dec inhib output of GPm to VL enhances stim of motor cortex
Term
4 primary sx of PD
Definition
resting tremor, rigid, bradykin, postural problems
Term
2nday sx of PD (5)
Definition
masked fascies, hypophonic speech, stooped posture with shuffling/propulsive gait, micrographia, autonomic disfxn
Term
what are Lewy bodies?
Definition
eosinophilic, intraneuronal cytoplasmic inclusions
Term
why give anticholinergics to PD pts?
Definition
counteract 'unnopposed' cholinergic system
Term
SEof dopamine therapy?
Definition
hallucination, psychosis,chorea, dystonia, nv, hyperkinesia
Term
two surgical procedures for PD
Definition
pallidotomy (GPm), STN stim
Term
gross path of HD?
Definition
atrophy of caudate
Term
rx for HD?
Definition
haldol (DA antag)
Term
put to GPl +/-?
Definition
-
Term
GPl to STN +/-?
Definition
-
Term
STN to GPm +/-?
Definition
+
Term
GPm to VA/VL +/-?
Definition
-
Term
VA/VL to cortex +/-?
Definition
+
Term
put to GPm +/-?
Definition
-
Term
cortical components of limbic system
Definition
subcallosal, anterior cingulate, post cingulate, parahippocampal-entorhinal, orbitofrontal, and insular cortices
Term
extracortical componenets of the limbic system
Definition
olf bulb, piriform olf cort, hypothal, amyg, hippocampus, VA thal, septal nn., n. accumbens (ventral striatum)
Term
amygdala lesion produces inabillity to recognize which facial expression?
Definition
fear
Term
path of smell...
Definition
olf epithelium, glomeruli, mitral cells that make up olf tract
Term
what is the cortical target of smells?
Definition
piriform, medial amygdala, entorhinal cortex
Term
what hypothalamic n. does the amygdala communicate with and how?
Definition
VM via the stria terminalis
Term
what part of the limbic system directly affects autonomics?
Definition
amyg
Term
what part of the hippo give rise to the fornix?
Definition
CA1
Term
where does the fornix terminate?
Definition
mamms, VA, subcallosal cortex
Term
what is the lesion producing Kluver-Bucy?
Definition
B/l lesions of TL
Term
sx of Kluver-Bucy?
Definition
visual agnosia, oral tendencies, loss of fear/anger, hypersex
Term
components of hippocamp?
Definition
subiculum, CA, dentate gyrus
Term
hormone regulated by the hippo?
Definition
cortisol
Term
what aspect of memory is knocked out by b/l hippo lesions?
Definition
declarative
Term
Papez circuit...
Definition
hippo-mamm-ant n.-cingulate-enterorhinal (H.MACE, FMACP)
Term
biochem of LTP?
Definition
NMDAR activate inc number of AMPA GluR increasing postsyn response to Glu
Term
what causes Wernicke's encephalopathy?
Definition
lack of B12
Term
sx of Wernkikes encephalopathy?
Definition
confusion, visual problems, stupor, coma, hypotherm, hypotens, ataxia
Term
chief feature of Korsikoff's syn?
Definition
inability to form new memory or retrieve old mem
Term
why can older animals not terminated stress related cortisol secretion rapidly?
Definition
degen of hippocampal neurons
Term
what substances participate in nocioceptive transduction?
Definition
SP, AA metabolites, CGRP, neurokinin A
Term
what nerve afferents are assoc with pain?
Definition
A-d, C
Term
myelination of A-d fibers?
Definition
small my
Term
myelination of C fibers?
Definition
un
Term
what nerves carry visceral nocioception?
Definition
SDANS
Term
where doe nocioceptive fibers terminate in the SC and BS?
Definition
spV n.
Term
what lamina are the origin fo the STT?
Definition
I, IV, V
Term
what NTs are released in pain afferents in the short term?
Definition
Glu
Term
what NTs are released in pain afferents in the short term?
Definition
SP, CGRP, ATP
Term
pathways of the lateral pain system
Definition
lSTT --> VPL, trigeminothalamic --> VPM
Term
characteristics of the lateral pain system
Definition
small fields, fast CNS conductance, high somatotopy
Term
fxn of lateral pain system
Definition
discrim of loc/intensity
Term
pathways of the medial pain system
Definition
lateral system, SRtT, FG/C, DLF
Term
projections of the medial pain system
Definition
intralaminar thalamus --> ant. cing. cortex
Term
characteristics of med pain system
Definition
large fields, slow conductance (multi-syn), no somatotopy, opiodR in the Ant. Cing. Cortex
Term
mech of pain gating
Definition
activation of med/large myelinated afferents, which activate dorsal horn interneurons
Term
two ways to activate the PAG
Definition
input (ACC, ascendings), disinhibition (i.e. opiates)
Term
NT of descending PAG mediated inputs to dorsal horn?
Definition
5ht, NE
Term
action of descending PAG mediated inputs to dorsal horn
Definition
inhibition of neurons, stim of interneurons to release ENK
Term
d allodynia
Definition
pain from nonnoxious stim
Term
d causalgia
Definition
chronic burning (neural trauma)
Term
d reflex sympathetic dystrophy
Definition
pain mediated by abnmly active symp fibers
Term
what is Hansen's disease?
Definition
leprosy, loss of skin innervation
Term
main lamina of the STT?
Definition
V
Term
wide dynamic range, low threshold characteristic of...
Definition
ant STT
Term
what do wide dynamic range neurons sense?
Definition
crude touch
Term
what do low threshold neurons sense?
Definition
movement
Term
what projections does lamina I send to the STT?
Definition
pain, temp
Term
what sort of pain travels in A-d?
Definition
acute
Term
what sort of pain travesl in C fibers?
Definition
"aches"
Term
simple explanation for referred pain
Definition
somatovisceral convergence in the dorsal horn
Term
lamina I projects to what part of the STT?
Definition
lat
Term
lamina V projects to what part of the STT?
Definition
ant
Term
NT assoc with allodynia?
Definition
SP
Term
4 basic mechanisms of HA
Definition
inc ICP, vascular distention, inflammation, muscle contraction
Term
signs/sx of migraine
Definition
prodrome, sometimes w/ visual changes; throbbing, pounding, unilateral pain; photosonophobia, dizzy, N+V
Term
signs/sx of cluster HA
Definition
periorbital pain, ipsi red watery eye, transient Horner's, nasal d/c
Term
2 theorys of migraine pathophys
Definition
1. vascular reactivity 2. Trigeminovasc theory
Term
migraine aborting drugs
Definition
ergot alkaloids (DHE), (suma)triptan
Term
migraine prevention drugs
Definition
b-blockers, Ca chann blockers, methysergide, TCA, valpro
Term
signs/sx of tension HA
Definition
steady, bandlike pressure, little autonomic stuff
Term
rx of tension HA
Definition
TCA, anti-inf, stress avoidance
Term
what is pseudotumor cerebri
Definition
inc ICP (impaired CSF resorption?)
Term
rx for pseudotumor cerebri
Definition
shunt, acetazolamide
Term
what populations are at highest risk for temp arteritis?
Definition
elderly
Term
what are associated findings with temp arteritis?
Definition
polymyalgia, high ESR
Term
rx for temp arteritis?
Definition
corticosteroids
Term
danger of temp ateritis?
Definition
blindness
Term
ominous HA signs
Definition
no prior, sudden/prog worsening of chronic, wake up, seizure/loc, mem/person/neuro
Term
advantages of CT
Definition
rapid, less motion artifact, fresh hemmorhage, good skull bone pic
Term
disadvantages of CT
Definition
poor imaging of post fossa, rads, intrathecal contrast
Term
advantages of MRI
Definition
hi-res, greater path than CT, no bony artifact, multiple planes w/o repositioning pt
Term
disadvantages of MRI
Definition
slower, more sensitive to motion artifact, METAL!!!
Term
white on CT
Definition
BBC - blood, bone, calcium
Term
what are the two types of partial seizures?
Definition
simple, complex
Term
what are the two types of gen seizure?
Definition
non-con, con
Term
what is a simple partial seizure?
Definition
rythmic invo, tonic-clonic of body part w/o loc
Term
what is a complex partial seizure?
Definition
impaired conc, "staring into space", automatisms
Term
most frequent seizure focus?
Definition
med temporal lobe
Term
what is a gen, non-con seizure?
Definition
brief loc (absence)
Term
what is a gen, con seizure
Definition
grand mal
Term
mechs to prevent seizure?
Definition
collaterals to inhibitories, uptake of K by astros, spread of dendritic tree
Term
a malfunction of which part of the brain causes complex partial seizures?
Definition
med temp (hippo, amyg)
Term
what sort of channel is implicated in benign familial neonatal convulsions?
Definition
K-M
Term
what is neuromyotonia?
Definition
autoimmunie disease of V-gate K channels
Term
d myotonia
Definition
involuntary contractions following voluntary contractions
Term
channels implicated in myotonia?
Definition
Na/Cl
Term
human dom myotonia congenita, recessive myotonia congenita
Definition
Cl channel mediated
Term
hum dom myontonia congenita AKA
Definition
DMC, Thomsen's
Term
human paramyotonia congenita, hyperkalemic periodic paralysis
Definition
Na channel mediated
Term
sx of malignant hypertherm
Definition
rigidity, hypermet, fever
Term
cause of MH
Definition
mut of Ca channel in SR
Term
episodic ataxia 1, MG, Hyperplexia
Definition
K channel mediated
Term
where is aqueous humor made?
Definition
cilliary processes
Term
what sort of neurons project to the EWN in the pupillary light reflex?
Definition
pre-tectal
Term
where is vitreous humor?
Definition
between the lens and the retina
Term
what is the arterial supply to the eye?
Definition
opth. a. from ICA
Term
what is the arterial supply of the retina?
Definition
central retinal a.
Term
what is a diopter?
Definition
1/focal length
Term
how much of the optical power of the eye is in the cornea?
Definition
2/3
Term
what does contraction of the cilliary muscle do to the lens?
Definition
allows it to fatten
Term
how is myopia corrected?
Definition
with negative diopters
Term
how is hyeropia corrected?
Definition
with pos diopters
Term
myopia is near/far sightedness?
Definition
near
Term
what is presbyopia?
Definition
hyperopia from loss of elasticity in lens
Term
how is the lens dehydrated?
Definition
by the Na/K pump
Term
how does the cornea get energy to supply the Na/K pump
Definition
glucose from anterior chamber, o2 from the air
Term
how does the lens get E to supply the Na/K pump?
Definition
glucose from aqueous humor, anaerobic metabolism
Term
where is aqueous humor reabsorbed?
Definition
in the anterior chamber thru the spaces of Fontana
Term
where does aqu. humor go after it passes through the space of Fontana?
Definition
canal of Schlemm
Term
where does aqu. humor go after it passes through the canal of Schlemm?
Definition
ant. cilliary v.
Term
what is found in the outer layer of the retina?
Definition
pigmented epithelium
Term
what is found in the inner layer of the retina?
Definition
neural elements
Term
do photoreceptors use APs?
Definition
nyet
Term
what colors is rhodopsin sensitive to?
Definition
blue, green
Term
when are rods most useful?
Definition
low-light
Term
3 types of cones
Definition
green, red, blue
Term
more sensitive to light rods/cones?
Definition
rods
Term
general fxn of horizontal cells?
Definition
inhibit neighboring photoRs, contribute to concentric fields
Term
general fxn of bipolar cells?
Definition
input from photoR and horiz, excite amacrine and ganglion cells
Term
general fxn of amacrine cells?
Definition
input from bipolar cells, contribute to receptive fields of ganglion cells
Term
what cells activate ganglion cells?
Definition
bipolar, amacrine
Term
fxn of ganglion cells?
Definition
transmission along optic nerve
Term
3 types of ganglion cells
Definition
Y, X, W
Term
large ganglion cells?
Definition
Y
Term
small ganglion cells?
Definition
X
Term
what stimulus do W-cells respond to?
Definition
light intensity
Term
to where do W-cells project?
Definition
sup coll, pretectal region
Term
what are Mueller cells?
Definition
similar to astros, regulation of ionic/NT environ of retina
Term
what happens when retinal is struck by a photon?
Definition
11-cis --> all trans
Term
all-trans retinal acts like a...
Definition
G protein R
Term
retinal activates...
Definition
transducin
Term
transducin activates...
Definition
cGMP phosphodiesterase
Term
what effect does dec. cGMP concentration have in phototransduction?
Definition
cGMP dissociates from Na/Ca channels, closing them
Term
what is dark current?
Definition
in/out Na movement in the photoreceptor
Term
what is the effect of the closing of the Ca channel in phototransduction?
Definition
decreased Glu release
Term
glutamate is inhibitory to hor/bip cells in...
Definition
on-centers
Term
glu is excitatory to hor/bip cells in...
Definition
off-centers
Term
are Y cells good at color discrim?
Definition
no
Term
what are Y cells not good at color discrim?
Definition
recieve input from all 3
Term
Y cells: large/small fields?
Definition
large
Term
projection of Y cells?
Definition
magnocellular in LG
Term
what are Y cells sensitive to?
Definition
movement
Term
how many types of cones are X cells sensitive to?
Definition
one
Term
discuss X cells as they related to on-center fields
Definition
ex/inhib reversed with two colors
Term
X cells: small/large fields?
Definition
small
Term
to where to X cells project?
Definition
parvocellular LG
Term
what surrounds the optic nerves?
Definition
pia, arach, dura
Term
what part of the retina decussates at the chiasm?
Definition
nasal (temporal field)
Term
what part of the retina remains uncrossed at the chiasm?
Definition
temporal (nasal field)
Term
why do some optic fibers project to the suprachiasmatic n?
Definition
ciracdian rythym
Term
how are fibers in the optic tract oriented?
Definition
similar visual fields are close to each other
Term
in which tract is the right visual field?
Definition
left
Term
which layers in the LG recieve ipsilat input?
Definition
235
Term
which layers in the LG recieve contralat input?
Definition
146
Term
what part of the LG is the parvocellular region?
Definition
four outer laminae
Term
what part of the LG is the magnocellular region?
Definition
2 inner laminae
Term
which part of the LG is involved in depth and contrast?
Definition
magno (y)
Term
how does the lower visual field get from the LG to 17?
Definition
courses over the lateral vent
Term
how does the upper visual field get from the LG to 17?
Definition
around inferior horn of lat vent
Term
upper visual field on bottom/top of CalcSulc?
Definition
bottom
Term
where is the left visual field in the cortex?
Definition
right 17
Term
macula terminates on post/ant occipital lobe?
Definition
post
Term
what is the fxn of the "dorsal stream" of visual processing?
Definition
"where"
Term
what is the fxn of the "ventral stream" of visual processing?
Definition
"what"
Term
where does the stapes attach?
Definition
oval window
Term
what innervates the tensor tympani?
Definition
V
Term
what innervates the stappedius?
Definition
VII
Term
what is the core of the bony labyrith called?
Definition
modiolus
Term
what window is assoc with the scala vestibuli?
Definition
oval
Term
what window is assoc with the scala tympani?
Definition
round
Term
where is the organ of Corti?
Definition
in the scala media (cochlear duct)
Term
what fills the membranous labyrinth?
Definition
endolymph
Term
between scala vestibuli and the cochlear duct?
Definition
vestibular membrane
Term
between scala tympani and the cochlear duct?
Definition
basilar membrane
Term
perilymph high in...
Definition
NaCl
Term
endolymph high in...
Definition
K+
Term
where do inhibitory inputs to the hair cells come from?
Definition
olivocochlear nerves
Term
what allows for frequency sensitivity along the organ of corti?
Definition
floppiness of the basilar membrane
Term
what NT do hair cells release?
Definition
Glu
Term
where are hi freq sounds best heard?
Definition
near the oval window
Term
where are low freq sounds best heard?
Definition
near the helicotrema
Term
path of sound APs?
Definition
cochlear n. fibers - d/v cochlear nn. - SON - ll - ic - bic - mg
Term
where does sound localization occur first?
Definition
S.O.N.
Term
which nucleus projects to the c/l S.O.N.?
Definition
dorsal cochlear
Term
what is the case if Rinne's is bestter heard on bone?
Definition
conductive deafness
Term
what is the case if louder on one side?
Definition
conductive deafness on that side or sesorineural deafness on the other side
Term
what decibel loss is considered abnml?
Definition
-20db
Term
what causes sensirneural deafness?
Definition
hair cell damage
Term
painful spasm of jaw, face, back; impaired swallow/breathe; seizures
Definition
tetanus
Term
dx of tetanus?
Definition
clinical
Term
rx for tetanus
Definition
ICU, vent, NMJ blockade, sedation, Ig
Term
ptosis, diplopia, pupillary paralysis, dysphagia, weakness, respiratory paralysis
Definition
botulism
Term
dx botulism
Definition
clinic,bioassay, emg
Term
rx for butulism?
Definition
equine antitoxin, guanidine
Term
sx of CO tox?
Definition
HA, v, blurry, coma, seizures, Cp arrest
Term
rx CO tx?
Definition
%100 O2 or hyperbarics
Term
rx for EtOH withdrawl seizures?
Definition
benzo, hydration, B12
Term
nystagmus, ataxia, opthalmoplegia, confusion
Definition
Wernicke's encephalopathy
Term
sx of Wernicke's encephalopathy?
Definition
nystagmus, ataxia, opthalmoplegia, confusion
Term
sx of Korsikoff syndrome?
Definition
amnestic w/ confab
Term
a chronic amnestic syndrome with confabulation
Definition
Korsikoff
Term
path of W-K syndrome?
Definition
petechiae/gliosis in mamm, fornix, 3rd vent
Term
sx of meningitis?
Definition
fever, malaise, lethargy, ha, nv, impaired conc, nuchal rigidity, meningeal irritation signs
Term
dx of meningitis?
Definition
clinical w/ LP
Term
LP reveals >500 WBC (pmn), high protein, low glucose
Definition
bacteria
Term
LP reveals <500 WBCs, normal/hi protein, nml glucose
Definition
virus
Term
LP reveals <500 WBCs, high protein, low glucose
Definition
Tb vs. fungus
Term
LP reveals <500 WBCs, high protein, nml/low glucose
Definition
syphillis
Term
complications of bac meningitis
Definition
hydroceph, infarction, deafness
Term
sx of chronic meningitis
Definition
mild ha/confusion, usually no obvious signs
Term
suseptible group for chronic meningitis?
Definition
elderly/immunocomp
Term
rapid onset (hrs, days), fever, HA, altered behavior/conc, seizure/focal deficets
Definition
encephalitis
Term
what distinguishes encephalitis from meningitis?
Definition
focal deficit, seizure
Term
area of herpes encephalitis?
Definition
inf frontal, medial temporal
Term
sx of herpes encephalitis?
Definition
aphasia, memory change, behavior change
Term
dx of viral encephalitis?
Definition
LP w/ PCR, MRI, Ab titer
Term
rx for viral encephalitis?
Definition
ICU, control ICP, anticonvulsant, antivirals
Term
CST, EPS, cerebellar, LMN signs, dementia, myoclonus, rapid progression
Definition
CJD
Term
sx of CJD?
Definition
CST/EPS/Cerebellum/LMN, dementia, myoclonus, rapid onset
Term
systemic infection, HA, meningitis, seizures, focal signs
Definition
abscess
Term
what causes PML
Definition
papovavirus in oligos
Term
what is PML?
Definition
progressive multifocal leukoencephalopathy
Term
what cells in the brain are most sensitive to ischemia?
Definition
neurons
Term
what cells in the brain are least sensitive to ischemia?
Definition
astros
Term
most to least sensitive cells in brain to ischemia?
Definition
neurons, oligos, endos, astros
Term
two really sensitive types of neurons when talking about ischemia?
Definition
pyramidals in the hippo, purkinjes in the cerebellum
Term
what are "pink" neurons?
Definition
those that have died due to ischemia, eosinohilia and loss of cyto, pkynotic nuc
Term
what causes hemm. infarcts?
Definition
reperfusing an area of damaged endothelium
Term
what will a berry aneurysm give you?
Definition
SAH
Term
what percent of kids tumors are in the CNS?
Definition
20
Term
2 tumors of the pineal gland...
Definition
germinoma, pineocytoma
Term
2 tumors of the pituitary...
Definition
adenoma, craniopharyngioma
Term
what sort of astrocytoma is a GBM?
Definition
IV
Term
grading of astrocytomas
Definition
1. cellularity 2. mitosis 3. vasc hyperplasia 4. necrosis
Term
gross path of GBM
Definition
yellow necrosis, reddish hemm, cystic change, may cross CC
Term
a tumor with gross yellow necrosis, reddish hemm, cystic changes
Definition
GBM
Term
gross path of fibrillary astrocytoma
Definition
expansion of white, gray white blurring
Term
a tumor with gross expansion of white matter and blurring of the gray-white line?
Definition
fib ast
Term
micropath: fibrillary process, mild pleomorphism, no mitosis or vasc hyperplasia?
Definition
fib ast
Term
micropath: pleomorphic mal astros, necrosis, vasc hyperplasia, mitosis
Definition
GBM
Term
what is a common cause of oligodendrocytomas?
Definition
LOH
Term
common sites of ependymomas
Definition
4th, filum terminale
Term
micropath: true rosettes, pseudorosettes
Definition
ependymoma
Term
where are medulloblastomas in kids?
Definition
cerebellum
Term
micropath: sheets of undiff cells, scant cyto, dark nuclei, rosettes
Definition
medulloblastoma
Term
when do you get meningiomas?
Definition
50s.60s
Term
micropath: sheets and whorls of semisensitial cells, pale nuclei
Definition
meningioma
Term
micropath: spindle cells in fascicles, antoni patters
Definition
Schwannoma
Term
age of pit adenoma?
Definition
30-60s
Term
micropath: monotonous sheet of neuroendocrine cell
Definition
pit adenoma
Term
% of CNS tumors that are mets?
Definition
25-30
Term
most common met to CNS?
Definition
lung, breast
Term
where do you usually find brain mets?
Definition
gray-white jxn
Term
where do you usually find fib astrocytomas?
Definition
cerebral hemispheres
Term
where do you find oligodendrocytomas?
Definition
frontal/temporal lobees
Term
what part of LG is parvocellular?
Definition
4 outer laminae
Term
horizontal/bipolar inhib or excite?
Definition
inhib/excite
Term
dorsal stream?
Definition
where?
Term
ventral stream?
Definition
what?
Term
which hair cells insert onto the tectorial membrane?
Definition
outer
Term
agrpahia, r-l confusion, dyscalculia, finger agnosia
Definition
Gerstmann's, dom par lobe
Term
3a
Definition
c/l spindles
Term
3b, 1
Definition
c/l cutaneous
Term
2
Definition
c/l joints
Term
where are saccades produced?
Definition
FEF
Term
what does the DLPFC do?
Definition
antisaccades!
Term
where do cortical assoc bundles come from?
Definition
II
Term
with what part of the LG is the "what" path associated?
Definition
parvo system
Term
with what part of the LG is the "where" path associated?
Definition
magno
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