702 



THE EAR 



branches of the cochlear nerve, which are continuously given off all the 

 way from the hase to the apex of the osseous spiral lamina, and which 

 pass outward through the foramina nervosa upon the basilar membrane 





p -. -_. 



.DC 





f 



f. 



- y-.-W" ---,--' 



FIG. 586. AXIAL SECTION THROUGH A TURN OF THE COCHLEA OF A GUINEA-PIG. 



a, bone of the outer wall of the cochlea; b, membrane of Reissner; d, membrana 

 tectoria; DC, cochlear duct or scala media; /, stria vascularis; g, organ of Corti; h, 

 spiral ligament; i, cells of Claudius; k, scala tympani; I, scala vestibuli; m, vestibular 

 lip of the linibus spirale; n, internal spiral sulcus; o, nerve fibers of the cochlear 

 nerve, contained within one of the radiating canals within the osseous spiral lamina; 

 p, nerve cells of the spiral ganglion; q, blood-vessel; r, external spiral sulcus, upon 

 which open Shambaugh's glands; s, prominentia spiralis, containing the vas prom- 

 inens. X 90. (After Bohm and von Davidoff.) 



to be distributed to the epithelium of the spiral organ (of Corti). This 

 organ is a peculiar spiral group of neuro-epithelial cells which extends 

 the whole length of the basilar membrane from the base to the cupola 

 of the cochlea. 



