A manual of otology for students and practitioners . e apex and at the baseopens into the saccule by a small, short canal, the cannalisreuniens Hensenii. These scalse are filled with fluid;the cochlear duct contains endolymph, while the othertwo scalse contain perilymph. Organ of Corti.—Lying upon the basilar membrane inthe scala media is the organ of Corti, which is the end- INNER EAR 41 organ of the cochlear branch of the eighth nerve (Fig. 16).This organ is formed as follows: There are two rows ofsupporting cells or rods, an inner (toward the cochlearaxis) and an outer row, which join at th
A manual of otology for students and practitioners . e apex and at the baseopens into the saccule by a small, short canal, the cannalisreuniens Hensenii. These scalse are filled with fluid;the cochlear duct contains endolymph, while the othertwo scalse contain perilymph. Organ of Corti.—Lying upon the basilar membrane inthe scala media is the organ of Corti, which is the end- INNER EAR 41 organ of the cochlear branch of the eighth nerve (Fig. 16).This organ is formed as follows: There are two rows ofsupporting cells or rods, an inner (toward the cochlearaxis) and an outer row, which join at their apices but areseparated at their attachment to the basilar membrane,thus enclosing a spiral space—the tunnel of Corti. Theysupport the hair cells to which terminal filaments of thecochlear nerve have been traced. These hair cells aretherefore the real nerve endings of the cochlear branchof the eighth nerve. They are arranged as follows: onerow internal to the rods and tunnel of Corti, and several Membrana tectoria. Outer hair cells. Nerve fibres. CelU of Deiters. ^ Oi/ter rod. Basilar membrane. Fig. 16.—Section through organ of Corti. (G. Retzius.) rows external to these structures. The external haircells are still further supported by Dieterss cells, whichrest upon the basilar membrane by expanded bases, theopposite ends projecting between the hair cells. Externalto the outer hair cells are the supporting cells of Henson,and still more externally are situated the cells of hair-like processes project from the free ends of thehair cells into the scala media. Stretching over these isthe tectorial membrane. In sections of the cochlea thismembrane appears variously displaced and distortedbut it is probable that in the recent state its periphery 42 ANATOMY AND PHYSIOLOGY OF THE EAR is attached to Cortis organ external to the outer haircells, and it thus lies floating upon the ciliary processesof the hair cells and by its movement in vibration of thela
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