226 PHYSIOLOGY FOR BEGINNERS CHAP. 



section, and one side, namely, that forming as it were the 

 base of the triangle, carries the auditory epithelium, and is 



FIG. 108. Diagram of a section of a coil of the cochlea. 



C.C, canal of the cochlea ; niR, its upper wall ; Sc. V, the part of the bony cavity 

 above the canal of the cochlea ; Sc. T, the part below it ; O.C, the organ of Corti 

 on the basilar membrane ; A.A T , branch of auditory nerve in the central column 

 of the spiral; a, connective tissue cushion to which the basilar membrane is 

 attached ; b, the bony walls ; m.t, a membrane lying over the organ of Corti ; l.i, 

 the spiral ledge projecting from the axis. 



known as the basilar membrane. This auditory epithelium 



