Auditory pathway

Question 1

1st order neuron

Answer 1

Sensory neurons , bipolar in spiral ganglion
peripheral branches synapse with hair cells of organ of Corti
central branches follow cochlear nerve to cochlear nuclei

Question 2

Sensory axons enter brain stem

Answer 2

at junction of pons and medulla
bifurcate
terminate in ventral and dorsal cochlear nuclei

Question 3

2nd order neuron from Dorsal cochlear nuclei

Answer 3

axons to contralateral superior olivary nucleus

Question 4

2nd order neuron from Ventral cochlear nuclei

Answer 4

axons to ipsilateral superior olivary nucleus

Question 5

Superior olivary nucleus

Answer 5

Medial: processes time it takes for sound
Lateral: processes intensity of sound
via trapezoid body 
3rd order neuron:
forms lateral leminiscus
terminate in inferior colliculus

Question 6

4th order neuron from Inferior colliculus

Answer 6

neurons to medial geniculate body

Question 7

5th order neuron from MGB

Answer 7

from MGB to auditory cortex(sup. temporal gyrus) (Br. 41,42)

runs in caudal limb of internal capsule

Question 8

Sound attenuation reflex

Answer 8

Sound to ear - cochlear nerve - ventral cochlear nucleus - superior olivary nucleus - facial motor nuclei - facial nerve - stapedius mucle