Inner ear

Question 1

Vestibulocochlear organ

Answer 1

vestibule: balance
cochlear: sound

Question 2

location vc organ

Answer 2

petrous part temporal bone

Question 3

bony labyrinth

Answer 3

perilymph
bound by otic capsule
series of cavities eg. cochlear

Question 4

membranous labyrinth

Answer 4

endolymph
encircled by bony labyrinth
sacs and ducts (cochlear duct)

Question 5

superior olivary nuclei

Answer 5

medial (interaural TIME differences for sound localisation) and lateral (interaural diff with INTENSITY)

tegmentum of pons

receive BILATERAL input from ventral cochlear nucleus

SOUND LOCALISATION

Question 6

Inferior colliculi

Answer 6

from ipsilateral sup. olivary nuclei

roof of midbrain

info also from contralateral dorsal cochlear nucleus

Question 7

medial geniculate bodies

Answer 7

dorsal thalamus (back)

from ipsilateral inferior colliculus

TONOTOPIC ARRANGEMENT
AUDITORY SPACE MAP

Question 8

Auditory cortex

Answer 8

temporal gyrus of temporal lobe (primary auditory area)

IPSILATERAL medial geniculate body

tonotopic arrangement (frequency of sound related)

summation columns: neurons respond strongly to binaural input (both ears)

suppression columns: respind strongest to input from ONE of 2 ears

breaking down all auditory info: where, what it means etc

Question 9

meniere’s disease

Answer 9

dizzy , poor balance, can’t really hear clear sound