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The membranous labyrinth consists of a vestibular portion formed by two small sac-like dilatations, called the saccule and the utricle, the latter of which communicates with the semicircular canals by five openings.

Endolymph, en′dō-limf, n. the fluid within the membranous labyrinth of the ear.

These branches enter the structure of the elongated sacs and membranous labyrinth, radiating in all directions, and finally, they terminate upon the inner surface of the membrane, in minute papillæ, resembling those of the retina.

The inner portion, called the membranous labyrinth, consists essentially of a closed membranous sac, which is filled with the endolymph.

The cavity of this membranous labyrinth is filled with a fluid, the endolymph; and within the utriculus, sacculus and lagena are masses of inorganic matter called the otoliths.