Where Is Perilymph and Endolymph Located?

Perilymph has a similar ionic composition as extracellular fluid found elsewhere in the body and fills the scalae tympani and vestibuli. Endolymph, found inside the cochlear duct (scala media), has a unique composition not found elsewhere in the body.

Where is endolymph and perilymph found?

Within the inner ear, there are two types of fluid -- endolymph (inner fluid), and perilymph (outer fluid), separated by a membrane. Something like a "balloon within a balloon" arrangement.

Where is perilymph found?

Perilymph is an extracellular fluid located within the inner ear. It is found within the scala tympani and scala vestibuli of the cochlea. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid.