The Inner Ear

Question 1

what are the 2 labyrinths of the inner ear

Answer 1

the bony and the membranous labyrinths

Question 2

where are the bony and membranous labyrinths found

Answer 2

bony = in the otic capsule
membranous = suspended within the bony labyrinth

Question 3

what are the bony and membranous labyrinths filled with

Answer 3

bony = perilymph 
membranous = endolymph

Question 4

where are hair cells located and what is their role in hearing

Answer 4

located in organ of corti

pressure waves in perilymph move the hair cells, APs stimulated and conveyed to brain by cochlear nerve

Question 5

where is the organ of corti found

Answer 5

located on basilar membrane of the cochlear duct

Question 6

describe what the cochlear duct is suspended by and how it divides the cochlear canal

Answer 6

cochlear duct suspended by spiral ligament

divides cochlear canal into 2 parts; the scala tympani and scala vestibuli

Question 7

what is responsible for balance and movement perception in the head

Answer 7

the vestibular appartus

Question 8

what are the roles of the semi-circular ducts, the urticle and the saccule in movement perception

Answer 8

semi-circular ducts = detect angular movement change

urticle and saccule = detect linear movement change

Question 9

what are the 3 semi-circular canals of the inner ear

Answer 9

superior(anterior)
posterior
lateral

Question 10

what cranial nerve innervates the inner ear, and what does it split into

Answer 10

CN VIII, the vestibulocochlear nerve

splits into vestibular and cochlear nerves

Question 11

what travels through the internal acoustic meatus

Answer 11

CN VIII, CN VII(facial nerve), labyrinthine artery(and veins)