. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ts obvious function is to tighten the mem-branous region. Moreover, considered thus in the ag-gregate, the lamina spiralis is a triangular plate woundround upon a central conical core, and, therefore, broad-est at the base of the cochlea, and gradually taperingoif toward the apex. It is to be understood that the How is the auditory nerve introduced ? Describe Fig. 85. Whatis the construction of the spiral lamina ? FUNCTION OF THE COCHLEA. 269 cochlea, like al
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ts obvious function is to tighten the mem-branous region. Moreover, considered thus in the ag-gregate, the lamina spiralis is a triangular plate woundround upon a central conical core, and, therefore, broad-est at the base of the cochlea, and gradually taperingoif toward the apex. It is to be understood that the How is the auditory nerve introduced ? Describe Fig. 85. Whatis the construction of the spiral lamina ? FUNCTION OF THE COCHLEA. 269 cochlea, like all other portions of the labyrinth, is filledwith water. Upon the spiral lamina, issuing forth through its bonyportion, are placed the ultimate filaments of the auditorynerve. These, having cast off their white substance, comeinto relation with elongated vesicles, and are thus distrib-uted upon the membranous portion, the membrane be-ing kept uniformly tense by the action of the cochlearismuscle. Fig. 86, section of the cochlea, magnified six diame-ters, to show the distribution of the cochlear branch ofthe auditory nerve. Fig.
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