Figure 2414

Photomicrograph of cochlear canal. This photomicrograph shows a section of the basal turn of the cochlear canal. The osseous spiral lamina (OSL) and its membranous continuation, the basilar membrane (BM), as well as the vestibular membrane (VM) divide the cochlear canal into three parallel compartments: the scala vestibuli, the cochlear duct (CD), and the scala tympani. Both the scala vestibuli and the scala tympani are filled with perilymph, whereas the cochlear canal is filled with endolymph. Note the three walls of the cochlear canal, which are formed by the basilar membrane interiorly, the stria vascularis (SV) and underlying spiral ligament (Si) laterally, and the vestibular membrane superiorly. The spiral organ of Corti resides on the inferior wall of the cochlear canal. Dendrites of the cochlear nerve (CN) fibers that originate in the spiral ganglion (SG) enter the spiral organ of Corti. The axons of the cochlear nerve form the cochlear part of the vestibulocochlear nerve. x65.

The spiral organ of Corti is composed of hair cells, phalangeal cells, and pillar cells

The spiral organ of Corti is a complex epithelial layer on the floor of the scala media (Fig. 24.17). It is formed by

• Inner (close to the spiral lamina) and outer (farther from the spiral lamina) hair cells

• Inner and outer phalangeal (supporting) cells

• Pillar cells mesothelial cell

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