Ch. 18 Day 2 Flashcards
part of ear that collects sound waves and directs them to middle ear
external ear
part of ear we can see
auricle/pinna
2nd part of where sound waves go
external acoustic meatus
seperates external and mid ear
tympanic membrane
line ear canal
ceruminous glands
most of middle ear is the
typmanic cavity
tube in ear that is about 4 cm long
auditory tube
auditory tube helps
equalize pressure/balance
middle ear three auditory ossicles
malleus, incus, stapes
malleus fake name
hammer
incus fake name
anvil
stapes fake name
stirrup
malleus articulates with the
tympanic membrane
when malleus vibrates it vibrates the
incus
stapes sits on what
oval window
auditory ossicles are important to
amplify sounds
muscles that protect violent vibrations for middle ear
tensor tympani, stapedius
inner ear is where there is
balance and equilibrum special house receptors
coiled pathway in the ear is the
bony labyrinth
snail head of bony labyrinth is called
vestibule
snail antena of bony labrinith is called
semicircular canals
middle of snail bony labrinith
cochlea
soft structure in snail bony labyrinth
membranous labyrinth
soft structure to fill in the
utricle
saccule
soft structure to fill in semicircular canals
semicircular ducts
soft structure to fill in cochlea
coclear duct
fluid in bony labyrinth
perilymph
fluid in membranous labyrinth
endolymph
in vestibule two sacs called
utricle and saccule
utricle and saccule contain clusters of hair cells called
maculae
cilia of hair cells are embedded into
otolithic membrane
otolithic membrane is packed with crystals called
otoliths
hair cells synapse with afferent fibers from CN
CNVII
utricle orientation
horizontally
saccule orientation
vertically
utricle to sense
forward acceleration and deceleration
saccule to sense
verticle acceleration and deceleration
semicicular ducts detect
angular motion
each semicircular duct has a swelling called
ampulla
ampulla have clustors of
hair cells
hair cells of ampulla are on
ampullary crest
cilia of hair cells are embedded in
ampullary cupula
hair cells monitored by neurons from the
vestibular ganglion
axons of these vestibular ganglion form
vestibular nerve
coiled makes 2.5 turns in the central hub
cochlea
cochlea central hub called
modioulus
central cochlear duct is filled with
endolymph
cochlea oval window is at the base of the
vestibular duct
oval window filled with
perilymph
round window is at base of
tympanic duct
round window is filled with
perilymph
spiral organ aka
organ of corti
spiral organ have cilia of
hair cells
spiral organ more flexible basilar membrane than
tectorial membrane
spiral organ hair cells monitored by neurons from the
spiral ganglion
axons of spiral ganglion form the nerve CN
CNVIII
basilar membrane that is low frequency has
low pitch
CNVIII cochlear nuclei is in the
medulla oblongata
CNVIII has inferior colliculi on
both sides
thalamus
auditory cortex
