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UB ANA 113 Lec 20

The Ear

What are the 3 principle regions of the ear External ear, middle ear, Inner ear
auricle EXTERNAL EAR. Gathers sound
External auditory meatus EXTERNAL EAR. s-shaped tube. Outer 2/3 cartilage, Inner 1/3 = Bone
Why is the external auditory meatus a certain shape S-shape discourages things from flying in.
Purpose of hair and glands in ear collect dust
cerumenous glands secrete wax to repel insects
cerumen ear wax. sticky and unpleasant odor
otitis externa "swimmers ear". Inflammation of the external acoustic meatus due to an accumulation of bacteria
Tympanic membrane EXTERNAL EAR. ear drum. Separates outer ear from middle ear
What are the three layers of the tympanic membrane outer - modified skin. middle - fibrous. inner - mucous
How can you see the tympanic membrane? Pull auricle posterior and superior
Why would you want to look at the tympanic membrane? You can see through it into the middle ear to view the bone (malleus) and see if fluid is present
Where is the tympanic cavity located? In the middle ear
Another name for the Auditory tube eustachian tube
Auditory/Eustachian tube location connects middle ear with the nasal pharynx
Otitis media Middle ear infection. -Auditory/Eustachian tube is horizontal in children and bacteria can easily travel from the nasal pharynx to the middle ear
What are the ossicles of the middle ear Malleus, Incus, Stapes
Malleus "hammer". Connected to the tympanic membrane
Incus "anvil". In between the malleus and stapes
stapes "stirrup" connected to the beginning of the inner ear (oval window)
Where are the structures for hearing and equilibrium located? in the structures of the inner ear
What are the 2 portions of the "labyrinth"? outer bony and inner membranous
Cochlea "snail part" of inner ear
Where are perilymph and endolymph found? As part of the cochlea
Perilymph fluid outside membranous tube of cochlea
endolymph fluid inside membranous tube of cochlea. Allows the tube to float
Organ of corti INNER EAR. Allows for "hearing". Inside tubes of cochlea. Hair cells move and send electrical impulse to brain.
Auditory pathway sound->tympanic membrane->stapes->hit oval window->hit membrane->fluid produce waves->hair cells &organ of corti move->electrical impulse->CN VIII->nucleus of VIII in medulla->thalamus->temporal lobe
Vestibular apparatus Equilibrium
semicicular canals (3) Sense dynamic equilibrium
utricle and saccule sense static equilibrium
dynamic equilibrium movement
static equilibrium position of head
Created by: HugsAndKisses