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USMLE neuroanatomy
high yield neuroanatomy facts
77
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Professional
07/19/2007

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Term
what connects the brain hemishperes?
Definition
corpus callosum
Term
what is the left hemisphere responsible for?
Definition
language, math, sequence, analysis
Term
what is the right hemishpere responsible for?
Definition
non-verbal, musical, geometrical, spatial comprehension
Term
what part of the brain is responsible for vision?
Definition
occipital lobe
Term
what part of the brain handles hearing?
Definition
temporal lobe
Term
what part of the brain interprets taste?
Definition
insula, below postcentral gyrus
Term
what part of brain handles reading, writing?
Definition
angular gyrus
Term
where is wernicke's area?
Definition
temporal lobe, superior gyrus
Term
where is broca's area?
Definition
frontal lobe, near lateral fissure
Term
broca's aphasia
Definition
good comprehension, nonfluent speech
Term
wernicke's aphasia
Definition
fluent, nonsensical speech, poor comprehension
Term
what does the ACA supply?
Definition
medial cortex, leads to motor and sensory loss in contralateral legs/feet
Term
what does the MCA supply?
Definition
lateral cortex + anterior limb of internal capsue (leads to contralateral upper body loss of motion and sensation)
Term
what does the PCA supply?
Definition
occipital cortex (contralateral homonymous hemianopsia)
Term
what does the anterior choroidal artery supply?
Definition
basal ganglia, hypothalamus, posterior limb internal capsule
Term
what do the cerebellar arteries supply?
Definition
cerebellum and lateral brain stem (leads to ataxia/brainstem syndromes)
Term
signs of an internal carotid artery TIA
Definition
ipsilateral monocular blindness, hemiparesis, sensory loss, language disturbance
Term
vertebrobasilar artery TIA signs
Definition
vertigo, diplopia, ataxia, facial numbness/weakness, nausea
Term
signs of hypertensive hemorrhage into putamen
Definition
contralateral weakness, including face + contralateral hemianopsia
Term
hemorrhage into thalamus
Definition
contralateral hemiparesis, sensory changes, homonymous hemianopsia
Term
hemorrhage into pons
Definition
coma, small reactive pupils, quadriplegia
Term
hemorrhage into cerebellum
Definition
clumsiness, nausea
Term
Edinger-westphal nucleus
Definition
CN III, ciliary ganglion, to eye
Term
sup. salivary nucleus
Definition
nerve VII, sublingual/submaxillary ganglia to lacrimal, nasal, submandibular glands
Term
inferior salivary nucleus
Definition
CN IX, otic ganglion, to parotid gland
Term
pupillary light reflex
Definition
optic nerve --> tectal area --> Edinger-Westphal nucleus --> parasympathetic --> sphincter
Term
argyll-robertson pupil
Definition
damage to tectal arear: pupils constrict for near vision but not light
Term
parkinson's disease
Definition
loss of dopamine input from substantia nigra to striatum (caudate, putamen, globus pallidus)
Term
huntington's
Definition
atrophy of caudate nucleus
Term
where in the brain does copper accumulate in Wilson's disease?
Definition
lentiform nucleus
Term
anterior thalamus
Definition
part of limbic system
input from mamillary bodies, output via cingula to cortex
Term
lateral thalamus: ventral anterior nucleus
Definition
input from basal ganglia, output to premotor cortex
Term
lateral thalamus: ventral posterior nucleus
Definition
lateral: medial lemniscus, spinothalamic tract (proprioception, touch)
medial: trigeminal nerve (taste)
Term
lateral thalamus: venrolateral nucleus
Definition
input from cerebellum and basal ganglia, output to motor cortex
Term
medial thalamus
Definition
projects to frontal cortex
Term
posterior thalamus
Definition
medial geniculate: auditory
lateral geniculate: visual
Term
what does the pica supply?
Definition
lateral medulla
Term
medulla blood supply
Definition
lateral: PICA. medial: anterior spinal artery
Term
lower pons blood supply
Definition
lateral: AICA
Medial: basilar artery
Term
upper pons blood supply
Definition
lateral: SCA, medial: basilary artery
Term
wallenberg syndrome
Definition
infarction of lateral medulla (PICA)
Term
lateral medulla damage to spinal tract nucleus V leads to:
Definition
ipsilateral face pain/temp loss
Term
lateral medulla damage to nucleus solitarius:
Definition
ipsilateral loss of taste
Term
damage to reticular formation in lateral medulla
Definition
Horner's syndrome
Term
damage to nucleus ambiguus in lateral medulla
Definition
hoarseness, loss of pharyngeal reflex
Term
damage to spinothalamic tract in lateral medulla
Definition
contralateral pain/temperature loss
Term
damage to hypoglossal nerve in medial medulla
Definition
ipsilateral tongue paralysis + atrophy
Term
damage to medial lemniscus in medial medulla
Definition
contralateral loss of position/vibration sense
Term
damage to pyramidal tract in medial medulla
Definition
contralateral spastic paralysis
Term
damage to spinocerebellar tract in lateral pons
Definition
ipsilateral limb ataxia
Term
damage to nucleus VII in lateral pons
Definition
ipsilateral face paralysis
Term
damage to nucleus V in pons
Definition
ipsilateral face loss of sensation
Term
damage to reticular formation in lateral pons
Definition
ipsilateral Horner's syndrome
Term
damage to vestibular nucleus in lateral pons
Definition
vertigo
Term
damage to cochlear nucli in lateral pons
Definition
deafness/tinnitus
Term
damage to nucleus VII in medial pons
Definition
ipsilateral spastic face paralysis
Term
damage to medial longitudinal fasciculus in medial pons
Definition
ipsilateral eye cannot adduct
Term
damate to nucleus VI in medial pons
Definition
ipsilateral paralysis of lateral rectus
Term
damage to corticospinal tract in medial pons
Definition
contralateral spastic paralysis
Term
damage to medial lemniscus
Definition
contralateral loss of position/vibration sense
Term
damage to motor nucleus CN V in upper lateral pons
Definition
ipsilateral loss of masseter function
Term
syringomyelia
Definition
loss of pain/temperature arms and shoulders
Term
right MCA lesion
Definition
weakness/loss of sensation in left arm
Term
right ACA lesion
Definition
weakness/loss of sensation in left leg
Term
hemisection of left spinal cord
Definition
spastic paralysis, loss of proprioception in left leg and loss of pain/temp sensation in right leg
Term
guillain-barre
Definition
flaccid paralysis, loss of sensation both legs
Term
ALS
Definition
atrophy, fasciculations both arms and legs
Term
wallenberg syndrome (r. lateral medulla)
Definition
loss of pain/temp in left body, paralysis of left side, loss of sensation right lower face
Term
skull dermatome
Definition
C2
Term
thumb dermatome
Definition
C6
Term
nipple dermatome
Definition
T5
Term
belly button dermatome
Definition
T10
Term
big toe dermatome
Definition
L4
Term
penis dermatome
Definition
S3
Term
anus dermatome (lowest)
Definition
S5
Term
knee reflex
Definition
L4
Term
ankle reflex
Definition
S1
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