PPT 11 continued and PPT 12 physiology of hearing Flashcards
connects the middle ear to the nasopharynx and equalizes pressure
Eustachian tube
involuntary muscle contraction in the middle ear
acoustic reflex
occurs in response to high-intensity sounds
acoustic reflex
decreases the amount of energy transferred to cochlea
acoustic reflex
origin- posterior wall of middle ear insertion-stapes
stapedius
stiffens ossicular chain to reduce vibration
stapedius
contains a system of interconnecting tunnels called labyrinths
inner ear
rigid, bony wall of inner ear- cavities in bone
bony labyrinth
collection of fluid-filled tubes
membranous labyrinth
same general shape as bony labyrinth but buffered from bones with perilymph
membranous labyrinth
makes sure there is no friction between the bony labyrinth and membranous labyrinth
perilymph
list the two primary structures of the inner ear
semicircular cancels, cochlea
where does mechanical energy is convert to electrical impulses
inner ear
what is the primary structure of hearing
cochlea
set of 3 tubes in the inner ears
semicircular canals
has a primary function of vestibular system
semicircular canals
spiral-shaped cavity in inner ear
cochlea
list the three chambers of the cochlea
scala vestiboli, scala tympani, scala media
the sensory organ of hearing
organ of corti
also known as vestibular duct, contains perilymph, conducts sound vibrations to cochlear duct
scala vestibuli
also known as the tympanic duct, separated from cochlear duct by basilar membrane, contains perilymph
scala tympani
also known as cochlear duct, contains endolymph, contains organ of corti
scala media
negatively charged fluid, increased sodium
perilymph
positively charged fluid, increased potassium
endolymph
