A duct which carries the endolymph inside the membranous labyrinth.
A blind-ended duct that leads from the saccule and joins a duct from the utricle of the membranous labyrinth of the ear.
In the embryo, a tubular projection of the otocyst ending in a blind extremity, the endolymphatic sac. In the adult, it connects the endolymphatic sac with the utricle and saccule of the inner ear.