has a central cavity of the bony labyrinth, 2 recesses housing utricle and saccule, and oval window (lateral wall)

anterior (or superior), posterior (posterior vertical), horizontal (or lateral)

opens into round window

base of modiolus internal auditory meatus

two and 5/8 turns terminating in apex (or cupola

central pillar of bone (in cochlea)

upper duct (in cochlea)

lower duct (in coclea)

thin bony shelf divides these ducts in the cochlea

spiral lamina terminates as the hamulus and forms the

opening in cochlea

opening in cochlea

opening in cochlea

shared by sense organ of hearing, the cochlea and the sense organs of balance or semicircular canals

cilia embedded within cupula

within vestibule lie (houses otolithic organs)

within vestibule lie (houses otolithic organs)

utricle and saccule communicate by

houses Ressner’s membrane, basilar membrane, and organ of Corti

Cochlear Duct houses

Cochlear Duct houses

Cochlear Duct houses

separated by tunnel of Corti are four rows of hair cells on bed of