If the round window is motionless, the perilymph will not be moved by the vibration of the stapes of the oval window, reducing or eliminating the perception of sound.
Perilymph is one of two types of fluid in the inner ear, the other being endolymph. It surrounds the membranous labyrinth of the bony labyrinth. The inner part of the cochlea lies in the vestibular and scala tympani.
Perilymph, which has an ionic composition similar to that of extracellular fluid found elsewhere in the body (that is, K+-poor and Na+-rich), fills the scala tympani and vestibule. Hearing depends on high concentrations of K+ in the endolymph that bathe the apical membranes of sensory hair cells.
Perilymph, which has a similar ionic composition to extracellular fluid found elsewhere in the body, fills the eardrum and vestibular scales. Located in the cochlear duct (Scala Media), the endolymph has a unique composition found nowhere else in the body.
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