Auditory pathways

Question 1

auditory nerves=

Answer 1

3000 afferent nerve fibres, these are tonotopically organised.

fibres innervating IHC at low frequencies are near centre of the nerve

fibres innervating IHC at high frequencies are near the periphery of the nerve

Question 2

how is the auditory cortex arranged?

Answer 2

hierarchy

CORE REGION= Primary a1 auditory cortex

BELT REGION= first level of auditory association cortex

PARABELT REGION= highest level of auditory association cortex

so, auditory cortex moves sound from lower to higher level association areas

Question 3

what is the what pathway?

Answer 3

ventral stream= anterior parabelt moves to anterior temporal lobe

Question 4

what is the where pathway?

Answer 4

dorsal stream= posterior parabelt moves to posterior parietal cortex