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ANT 3120: Chapter 15
Special Senses
68
Anatomy
Undergraduate 1
01/18/2013

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Term
smell passes through
Definition
cribiform plate of the ethmoid bone
Term
taste buds
Definition
sensory structures that detect taste
Term
what nerves are involved with the sense of smell?
Definition
olfactory nerves (CNI)
Term
where are most taste buds located?
Definition
on papillae
Term
papillae
Definition
peg-like projections on the superior surface of the tongue
Term
3 types of papillae
Definition
1) filiform
2) funiform
3) vallate
Term
filiform papillae
Definition
1) give tongue a rough surface
2) appear white
3) No taste buds present
Term
fungiform papillae
Definition
1) red dots on tongue
2) taste buds are present
Term
vallate papillae
Definition
1) V shaped row located on the back of the tongue
2) taste buds are present
Term
accessory structures of the eye
Definition
1) eyebrows
2) eyelashes
3) eyelids
4) conjunctiva
5) lacrimal apparatus
6) extrinsic eye muscles
Term
functions of eyelids
Definition
1) protection
2) spread tears when blinking
Term
muscles associated with moving the eyelids
Definition
1) orbicularis oculi
2) levator palpebrae superioris
Term
function of orbicularis oculi
Definition
closes eyelids
Term
function of levator palpebrae superioris
Definition
opens upper eyelid (muscle involved with ptosis)
Term
conjunctiva
Definition
mucous membrane that covers the eyelid (palpebral conjunctiva) and the anterior portion of the sclera (bulbar conjunctiva)
Term
the lacrimal apparatus consists of
Definition
1) lacrimal gland
2) nasolacrimal duct
Term
what produces tears?
Definition
lacrimal gland
Term
function of tears
Definition
lubricate and cleanse the eye
Term
3 layers of the eyeball
Definition
1) fibrous tunic
2) vascular tunic
3) retina
Term
fibrous tunic
Definition
avascular external layer of the eyeball
Term
fibrous tunic consists of
Definition
1) sclera
2) cornera
Term
sclera
Definition
white of the eyes
Term
function of sclera
Definition
1) helps maintain the shape of the eye
2) protects the internal structures of the eye
3) provides attachment point for the extrinsic eye muscles
Term
cornea
Definition
anterior portion of the fibrous tunic; curved shape helps focus light rays
Term
vascular tunic consists of
Definition
1) choroid
2) ciliary body
3) iris
Term
choroid
Definition
highly vascular membrane which contains a brown pigment (which helps absorb light)
Term
ciliary body
Definition
anterior thickening of the choroid
Term
function of the ciliary body
Definition
1) controls shape of the lens
2) produces aqueous humor
Term
iris
Definition
colored portion of the eye
Term
pupil
Definition
hole in middle of iris
Term
function of iris
Definition
regulates the amount of light let into the eye
Term
rods and cones
Definition
specialized cells that are involved with vision
Term
function of rods
Definition
used for black and white vision
Term
major structures associated with the retina
Definition
1) rods and cones
2) macula lutea
3) fovea centralis
4) optic disc
Term
function of cones
Definition
used for color vision
Term
macula lutea
Definition
oval region lateral to the optic disc; contains the fovea centralis
Term
fovea centralis
Definition
area with the greatest visual acuity; contains only cones
Term
optic disc
Definition
location where retina exits the eye; also called the blind spot
Term
3 chambers of the eyeball
Definition
1) anterior chamber
2) posterior chamber
3) vitreous chamber
Term
location of anterior chamber
Definition
lies between the cornea and iris
Term
location of the posterior chamber
Definition
lies between the iris and lens
Term
what are the anterior and posterior chamber filled with
Definition
aqueous humor
Term
aqueous humor
Definition
clear fluid that nourishes the lens and cornea and maintains the shape of the eye
Term
location of the vitreous chamber
Definition
lies posterior to the lens
Term
the vitreous chamber is filled with
Definition
vitreous humor
Term
vitreous humor
Definition
jelly-like substance that helps maintain intraocular pressure
Term
function of lens
Definition
focuses on light rays on the retina
Term
what are the lens held in place by
Definition
suspensory ligaments
Term
3 major areas of the ear
Definition
1) external ear
2) middle ear
3) inner ear
Term
major structures of the external ear
Definition
1) auricle
2) external acoustic meatus
Term
auricle (pinna) [composition]
Definition
composed primarily of elastic cartilage
Term
function of auricle
Definition
collects sound waves and directs them toward the external acoustic meatus
Term
external acoustic meatus
Definition
ear canal; extends from the auricle to the tympanic membrane
Term
tympanic membrane
Definition
separates the external ear from the middle ear; vibrates due to sound waves
Term
lining of external acoustic meatus
Definition
ceruminous glands (produce cerumen)
Term
middle ear
Definition
air-filled cavity within the temporal bone
Term
associated structures of the middle ear
Definition
1) pharyngotympanic tube
2) auditory ossicles
Term
pharyngotympanic tube
Definition
cartilage tube that equalizes pressure between the middle ear and nasopharynx; also called auditory tube/eustachian tube
Term
pharyngotympanic tube: open or closed?
Definition
closed; opens while chewing, swallowing, and yawning
Term
auditory ossicles
Definition
bones located in the middle ear; malleus, incus, and stapes
Term
function of auditory ossicles
Definition
transmit vibrations from the tympanic membrane to the oval window
Term
oval window
Definition
separation between middle ear and the inner ear
Term
inner ear is filled with
Definition
fluid
Term
major structures associated with the inner ear
Definition
1) cochlea
2) vestibule
3) semicircular canals
Term
cochlea
Definition
contain receptors for hearing
Term
vestibule
Definition
contain receptors for equilibrium concerning linear movements
Term
semicircular canals
Definition
contain receptors for equilibrium concerning rotational movements
Term
where are semicircular canal receptors located?
Definition
in the ampullae
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