Ear Flashcards
What are the functions of the ear?
collect auditory stimuli
transduce the mechanical stimuli
transmit nerve impulses to CNS
What are the three parts of the ear?
external
middle
inner
What is the pinna?
outside of ear
elastic cartilage
What are cerminous glands?
located within skin of external acoustic canal
apocrine gland
ear wax
What is the tympanic membrane?
between external and middle ear
poorly vascularized
What is tympanic cavity lined by?
simple squamous to cuboidal, air filled
What are the auditory ossicles?
malleus, incus and stapes
What is the tensor tympani m.?
muscle of malleus
T or F: the vibration of sound on the tympanic membrane is transmitted through the middle ear to the cochlea?
true
What is eustachian tube?
communication between middle ear and nasophrayx
air pressure equalization
What is the guttural pouch?
ventral expansion of the eustachian rube in a horse
can be infected with fungus
What are the two parts of the inner ear?
bony labyrinth
membranous labyrinth
What does the bony labyrinth contain?
vestibule
semicircular canals
cochlea
What does the membranous labyrinth contain?
endolymph
cochlear duct
utricle, saccule
semiciruclar ducts
What is the cochlea subdivided into ?
scala vestibuli
cochlear duct
scala tympani
What is the pathway of sound?
outer ear tympanic membrane maleus, incus, stapes vestibular window scala vestibulli helicotrema scala tympani deflects cochlear duct and stimulates spiral stimulates organ of corti
What is the organ of corti?
hair cells for sterocilla
phalangeal cells for support
pillar cells moved by sound energy
What is the vestibular apparatus?
organs of equilbrium and motion detection
macula utriculi
macula sacculi
crista ampullaris
What is otoliths?
gravitational movement of endolymph in saccule and utricle displace these
What are semicircular ducts?
canals are right angles to one another
angular accleration and deceleration
T or F: displacement of cupula of endolymph stimulates hair cells in the crista ampullaris of the semicircular ducts?
true
