Q. Which of the following structures is not filled with endolymph?

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Solution:

Endolymph is the fluid contained in the membranous labyrinth of the inner ear. The membranous labyrinth is contained within the bony labyrinth, and within the membranous labyrinth is a fluid called endolymph. Utriculus, Sacculus and Semicircular canal are filled with endolymph, whereas the tympanic cavity is an air-filled cavity.