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An otolith  also called statoconium or otoconium or statolith, is a calcium carbonate structure in the saccule or utricle of the inner ear, specifically in the vestibular system of vertebrates. The saccule and utricle, in turn, together make the otolith organ

Otolith organs: general structure of an otolith organ. collective term used to refer to the utricle and the saccule, two components of the vestibular system that are designed to detect gravitational forces and linear acceleration of the head.

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