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1. A small sac.
2. The larger of two sacs of the vestibular labyrinth in the vestibule of the inner ear. It communicates with the semicircular ducts, the saccule, and the endolymphatic duct, all of which are filled with endolymph. In its wall is the macula utriculi, a sensory area with hair cells that respond to movement of otoliths as the position of the head changes.

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