IV Innervation of the Human Cochlea

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Abstract
The nerve fiber in the cochleas of aged people was studied using Holmes''silver impregnation and acetylcholinesterase staining methods. Nerves in the human cochlea were submitted for electron-microscopical as well as histochemical studies. The present technique will bring additional new information on the morphology of the human cochlea. The course of the nerve fibers in the organ of Corti as well as the osseous spiral lamina was observed and discussed in reference to the afferent and efferent fibers. The medial fascicle, which possibly contained some, if not all, of the efferent fibers, crossed the tunnel of Corti obliquely apicalward and joined the external spiral bundles. The basilar fascicle, on the other hand, crossed basalward and coursed further basalward in the external spiral bundle, changing from one bundle to the other. Loss of nerve fibers was dominant in the lower turn of the cochlea. Study of presbycusis along this line is promising.

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