NERVUS FACIALIS OF ALBINO MOUSE 



109 



intermedius. He also reports that cutting the facial nerve where 

 it passes across the cochlea did not result in a degeneration of 

 all of the nervus stapedius although there is a degeneration! of 

 the entire facial nerve distal to the cut. He offers no explanation 

 for this, other than the implied one that the nervus stapedius is 

 composed mostly of fibers arising in the microscopic ganglion 

 located at its place of origin from the facial nerve. 



Ch.T(f 



Fig. 9 Sagittal section through the nervus facialis at the lateral edge of the 

 ganglion geniculi and medial to the genu externum showing the two bundles of 

 fine fibers which pass from the ganglion peripherally in the nervus facialis. Same 

 series as figures 1, 2, and 3. 225 /x lateral to figure 3. X 166. 



Fig. 10 Transverse section through the nervus facialis just posterior to the 

 genu externum and through the origin of the nervus stapedius. The two bundles 

 of fine fibers are shown along the lateral side of the nerve. X 166. 



Remembering that the mouse and the ground-squirrel both 

 belong to the order rodentia, an order of mammals in which 

 there is little variation in anatomical structure, I am unable to 

 account for the differences in this nerve in the two animals. 



