Endolymph
Endolymph is one of the two types of cochlear fluids, the other being perilymph. It is located in the scala media of the cochlea.
It is secreted by the stria vascularis (also colloquially called the 'battery of the cochlea') on the outer wall of the scala media. It has a high level of potassium ions (K+) and generates a current called the endolymphatic potential, with positivity inside the scala media and negativity outside its wall (approximately 80 mV more positive than the perilymphatic compartment).
The endolymph and perilymph do not normally communicate.
See also
