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The vestibular apparatus of the inner ear. A. The orientations of the vestibular and cochlear divisions of the inner ear are shown with respect to the head. B. The inner ear is divided into bony and membranous labyrinths. The bony labyrinth is bounded by the petrous portion of the temporal bone. Lying within this structure is the membranous labyrinth, which contains the receptor organs for hearing (the cochlea) and equilibrium (the utricle, saccule, and semicircular canals). The space between bone and membrane is filled with perilymph, whereas the membranous labyrinth is filled with endolymph. Sensory cells in the utricle, saccule, and ampullae of the semicircular canals respond to motion of the head. (Adapted, with permission, from Iurato 1967.) Source: The Vestibular System, Principles of Neural Science, Fifth Editon Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available at: http://mhmedical.com/ Accessed: May 07, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
