It is filled with a liquid which at one place is called the perilymph, and at another place the endolymph.
"Physiology and Hygiene for Secondary Schools"
Francis M. Walters, A.M.
The outer portion is surrounded by a membrane which serves as periosteum to the bone and, at the same time, holds the liquid belonging to this part, called the perilymph.
"Physiology and Hygiene for Secondary Schools"
Francis M. Walters, A.M.
Between the bony walls of the passages and the membranous bag inside is a thin, clear fluid, the perilymph.
"A Practical Physiology"
Albert F. Blaisdell