A&P Lab Quiz 2

A&P Ear Anatomy.
Structure composing the external ear
Pinna (auricle), external auditory canal, tympanic membrane
structure composing the internal ear
semicircular canals, cochlea, vestibule
collectively calles the ossicles
incus (anvil), malleus (hammer), stapes (stirrup)
involved in equalizing the pressure in the middle ear with atmospheric pressure
pharyngotympanic (auditory) tube
vibrates at the same frequency as sound waves hitting it; transmits the vibrations to the ossicles
tympanic membrane
contains receptors for the sense of balance
semicircular canals, vestibule
transmits the vibratory motion of the stirrup to the fluid in the scala vestibuli of the inner ear
oval window
acts as a pressure relief valve for the increased fluid pressure in the scala tympani; bulges into the tympanic cavity
round window
passage between the throat and the tympanic cavity
pharyngotympanic (auditory) tube
fluid contained within the membranous labyrinth
incus (anvil)
fluid contained within the osseous labyrinth and bathing the membranous labyrinth
sacs found within the vestibule
saccule, utricle
contains the spiral organ of corti
cochlear duct
sites of the maculae
saccula, utricle
positioned all spatial planes
semicircular ducts
hair cells of spiral organ of corti rest on this membrane
basilar membrane
gelainous membrane overlying the hair cells of the spiral organ of corti
tectorial membrane
contains the crista ampullaris
function in static equilibrium
otoliths, saccule, utricle, vestibular nerve
function in dynamic equilibrium
ampulla, cupula, semicircular ducts, vestibular nerve
carries auditory information to the brain
cochlear nerve
gelatinous cap overlying hair cells of the crista ampullaris
grains of calcium carbonae in the maculae