370 



STRUCTURE OF THE COCHLEA. 



Fig. 1S8. 



Magnified section of cochlea. 



companied "by some vascular ramifica- 

 tions across the conduits of the colu- 

 mella to the spiral lamina. 



Fig. 189, section of the cochlea, mag- 

 nified six diameters, to show the dis- 

 tribution of the cochlear branch of the 

 auditory nerve from its perforation of 

 the columella to its termination on the 

 spiral lamina. 



Figs. 190, 191, showing the middle 

 and internal ear by a section of the 

 superior face of the petrous bone, and 

 principally the entire distribution of 

 the auditory nerve : ., #, hammer, 

 holding, &, &, &, its internal muscle ; c, 



Fig. 189. 



Fig. 190. 



Distribution of cochlear nerve. 



c, c, its anterior muscle ; and, d, its 

 external muscle ; e, e, anvil ; /", len- 

 ticular bone ; g, stirrup ; h, muscle 

 thereof; i, chorda tympani; j, fa- 

 cial nerve, receiving, &, great su- 



Ftn. 1C1. 



The ossicles and their muscles. 



General distribution of auditory nerve. 



perficial petrosal ; Z, cochlea ; m, auditory nerve; n, its cochlear branch ; 

 and, o, its vestibular branch, furnishing,^, branch of posterior vertical 



