ear and equlibrium hearing

outer ear

aurlicle , typanic membrane, externbal acoustic meatus

inner ear

osscilces such as malleous, incus, stapes, auditory tube

middle ear

cochlea, anterior,posterior,lateral semicircular canals, oval window, round window, vestibule

what is the external acoustic

meatus ?

ear canal

what does the extenral acoustic meatus contain ?

hair and wax

what does the external acoustic meatus do?

helps reduce infections by suppressing microbial growth

what is the typanic memebrane ?

divides the external ear from the middle ear which is the ear drum

what is purpose of the typanic memebrane ?

it vibrates due to sound waves that vibrate each ear ossicles

what does the auditory tube connect to what areas?

middle tube to pharynx and typanic area

what is purpose of the audiroty tube?

help equalize the pressure between space of middle ear and out of the body

what is the purpose of the ear ossicles?

convering sound waves into mechanical movement

what is the three ossciles from lateral to medial

malleous , incus , stapes

what are are the two small muscle that attache to each ear ossicle?

stapedius, tensor tempani

what structure does the stapedious attach to ?

staypes

what structure does the tympanic membrane attach to ?

malleous and incus

what is the purpose of the tensor typani

stiffens tempanic membrane

what is purpose of the stapedious

prevents exsessive moements of the staypes

the semicircular ducts contain receptors that detect

fluid movement

where are the hair cells found in the semicicrular canal?

in the ampulla

what is the function of the anterior semicircular canal?

up and down movement “yes”

what is the function of the lateral semicircular canal?

side to side movement “no”

what is the function of the posterior semicircular canal?

tilt side to side movement

Whhat is the cupula and where is it found

Its is a gel like structre that sits at end of each semicicrular canal

what is the function of the cupula ?

it senses head rotation that causes movement of the endolymph to knock that cupula and cause bending of the sterocillia

what part of the basilar membrane is responsible for high pitched sounds

base of cochlea

what part of the basialar memvrane is repsonsbile for low pitched sounds

tip of cochela

what are the three tube that are found in the cochela?

scale vestibuli, scale media, scala tympani

what fluid is found in the Scala vestibuli?

perilymph

what fluid is found in Scala media?

endolymph

what fluid is found in scala typani ?

perilymph

what is the nervous pathway for sound?

hair cells,vestibular cochelar nerve, inferior colliculi, thalamus, temporal lobe

the acceleration you feel when you are in an elevator and it begins to move up is detected by ?

macula of sacule

sound is deteected by when the blank of hair cells brush aganist blank meembrane in response to fluid moving beneath the basialr membrane

waves, tectorial