116 D. A. RHINEHART 



are no ganglia on the sympathetic nerves into which fibers from 

 the chorda could not be traced. 



If., Ramus cutaneus facialis and the anastomosis with the ramus 



auricularis vagi 



A short distance distal to the origin of the chorda tympani, 

 at the most posterior part of the bend of the facial nerve around 

 the tjTnpanic cavity, the ramus auricularis vagi anastomoses with 

 the facial nerve and the remainder of the branches of the facial 

 arise. These branches are the nervus auricularis posterior, the 

 nerves to the posterior belly of the diagastric and stylohyoid 

 muscles, and a branch which had a cutaneous distribution to 

 the skin of the auricle. This nerve I have called the ramus 

 cutaneus facialis. Because of the intimate relationship between 

 the cutaneous branch of the facial and the auricular branch of 

 the vagus, these nerves will be described together. 



The fibers which form the cutaneous branch of the facial 

 nerve are those of small size from the geniculate ganglion which 

 pass peripherally in the trunk of the facial nerve forming the 

 more dorsal and larger of the two bundles of fine fibers described 

 above (figs. 9 and 10, R.Cut.N.F.). The auricular branch of the 

 vagus arises from the cells of the ganglion jugulare and passes 

 anteriorly and laterally posterior to the tympanic cavity to reach 

 the lateral side of the facial nerve. No communication to it 

 from the glossopharyngeal nerve was seen. 



While the relations between the fibers from different sources 

 are rather complicated at the anastomosis, it is possible, be- 

 cause of the difference in the size of the fibers, to trace them from 

 section to section. The motor fibers of the facial nerve are the 

 largest, those from the geniculate ganglion the smallest, and those 

 from the vagus intermediate in size. From one transverse series 

 a model of this region was made. Outline drawings of this 

 model are shown as figures 11' and 12. 



The auricular branch of the vagus crosses the lateral side of the 

 facial nerve and breaks up into four small bundles (R.Aur.N.V.). 

 The cutaneous fibers of the facial pass under the fibers from the 



