INSIDE THE COCHLEA Regions of the basilar membrane

respond to different frequencies High frequencies near the oval

window, low frequencies at the apex

ORGAN OF CORTI Movement of cochlear fluid causes tectorial

and basilar membranes to bend Outer hair cells are stimulated leading to

action potentials in the inner hair cells

AUDITORY PATHWAYS

Inner hair cells synapse on bipolar cells forming the auditory nerve

Input from the left ear crosses to the right inferior colliculus

Medial geniculate nucleus of the thalamusPrimary auditory cortex of the temporal lobe