CHAP, iv.] 



HEARING. 



1341 



between the two, the apex of the triangle is also attached to the end 

 of a thin sheet of bone (Lam. sp.) which projects outwards into the 



I 



tl 





v&?a 



111 



s ife^ 

 ^|%$ 



- - *-$. tL i .~v 



--, -r-?O 



'^f^^^^^gpfe 



FlG. 177. DlAGKAM OF A TRANSVERSE SECTION OF A WHORL OF THE COCHLEA. 



Sc.v. Scala Vestibuli. Sc.T. Seala Tympani. C.chl. Canalis cochlearis. 



n.aud. auditory nerve. Gg.sp. Spiral ganglion. Lam.sp. Lamina spiralis. Ib. 

 limbus. L.v. labium vestibulare. Lt. labium tympani. m.R. membrane of 

 Reissner. Lg.sp. spiral ligament. Str.v. stria vascularis. Ory.C. organ of 

 Corti. m.b. basilar membrane, t.l. lymphatic epithelioid lining of the basilar 

 membrane on the tympanic side. m.t. tectorial membrane. 



tube from the axis for some considerable distance. The triangular 

 canalis cochlearis and the projecting sheet of bone thus completely 

 divide the perilymph space of the tube into two spaces, one above 

 and one below, (the cochlea being supposed to be placed vertical). 



