Last revised by Dr Francis Deng on 22 Mar 2022

Perilymph is one of the two types of fluid in the inner ear, the other being endolymph. It surrounds the membranous labyrinth within the bony labyrinth. The portion within the cochlea is located in the scala vestibuli and scala tympani.

It is a clear fluid with an ionic composition very similar to cerebrospinal fluid as the scala tympani and scala tympani communicate directly with the subarachnoid space via the perilymphatic duct (within the cochlear aqueduct). It has a high level of sodium (Na+) ions and helps to generate the endolymphatic potential.

The endolymph and perilymph do not normally communicate.

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