To understand the structure of the cochlear nerve, it's best to start with the anatomy of the ear. Your ear has three main ...

(See Box, "The Cochlea: Anatomy and Physiology.") The causes of SNHL are numerous. A partial list includes ototoxicity, presbycusis, Meniere's disease, birth trauma, exposure to excessive noise ...

This type is caused by hair-cell degeneration. The majority of affected cells are located in the basal coil of the cochlea. Audiometrically, sensory presbycusis is characterized by an abrupt high ...