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From Biology-Online Dictionary | Biology-Online Dictionary
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noun, plural: perilymph

The body fluid surrounding the membranous labyrinth of the inner ear, and separating it from the walls of the chambers where the labyrinth lies


The perilymph is a body fluid that can be found between the bony (osseous) labyrinth and the membranous labyrinth of the inner ear. Endolymph, which is another body fluid in the inner ear, is different from the perilymph. While the endolymph is the fluid contained in the membranous labyrinth, the perilymph is the fluid contained in the space (referred to as perilymphatic space) between the outer wall of the membranous labyrinth and the wall of the bony labyrinth. Thus, the perilymph is entirely separated from the endolymph. In terms of ionic composition, the perilymph is also different from the endolymph. In the endolymph, potassium ions are the major cation whereas in the perilymph, sodium ions are the major cation component. The perilymph in the bony labyrinth is continuous with the cerebrospinal fluid (via the perilymphatic duct), and thus is comparable to the ionic composition of the cerebrospinal fluid.


  • perilympha
  • Cotunnius liquid
  • liquor cotunnii

See also:

Related form(s):

  • perilymphatic (adjective, of, pertaining to, or containing perilymph)