A & P 2 Exam 1: Hearing Flashcards
otitis media
inflammation of the middle ear
ear infection
common in kids because their ear is so small it is easy to get up there
internal ear/labyrinth
2 divisions: bony labyrinth and membranous labyrinth
bony labyrinth
cavity in temporal bone with: semicircular canals, vestibule, cochlea
membranous labyrinth
ducts and sacs: semicircular ducts, utricle, saccule, cochlear duct
what is the fluid in the bony labyrinth
perilymph
what is the fluid in the membranous labyrinth
endolymph
cochlea
contains sensory receptors for hearing
what parts are involved in equilibrium
vestibule and semicircular canals
what is a soft wormlike tube that winds thorugh the full turns of the cochlea and separates the perilymph cochlea cavity into upper nd lower chambers (scala vestibuli and scala tympani)
cochlear duct
where does the scala vestibuli terminate
the oval window which seats the foot plate of the stapes
the scala tympani is bound by a membranous area called the—–
round window
what contains the receptors for hearing
spiral organ
what forms the floor of the cochlear duct
basilar membrane
roof of the cochlear duct is called the
vestibular membrane
mechanism of hearing
vibration of stapes at oval window creates pressure waves in perilymph of scala vestibuli which are transferred to endolymph in the cochlear duct
basilar membrane is displaced by pressure waves and the hairs bend - depolarization occurs from bending of hair cells