96 D. A. RHINEHART 



fibers more loosely arranged. All of its fibers are very fine. 

 There are no ganglion cells either along the great superficial or 

 the deep petrosal nerves and only a few along the nerve of the 

 pterygoid canal. With the exception of one elongated microscopic 

 ganglion about the middle of its course, these are single and 

 widely separated. 



In one series a few fibers were given off from the nerve of the 

 pterygoid canal to the mass of glands lying dorsal to the audi- 

 tory tube. Similar fibers could not be found in any other series, 

 nor were there other branches from this nerve. 



In addition to the sympathetic fibers to the sphenopalatine 

 ganglion by way of the nervus petrosus profundus and the nervus 

 canalis pterygoidei, others from the internal carotid plexus 

 reach the ganglion by way of the nervus abducens. These fibers 

 join the nervus abducens as two bundles slightly anterior to 

 the point of union of the two petrosal nerves. -^ They leave the 

 nervus abducens as four small bundles, two of which join the 

 ophthalmic nerve and the other two the sphenopalatine ganglion 

 just posterior to its middle (figs. 4 and 7, bundles h and c). 



Koch ('16) mentions the presence of sjrmpathetic nonmedul- 

 lated fibers from the cavernous plexus in the nervus abducens of 

 the dog. These leave the nerve more anteriorly to pursue an in- 

 dependent course. Piersol ('13) states that branches of the 

 sphenopalatine ganglion have been described joining the nervus 

 abducens. 



C. Ganglion sphenopalatinum. It will be shown later that 

 none of the fibers of the sphenopalatine nerves end in the spheno- 

 palatine ganglion. This ganglion belongs, therefore, more to 

 the facial than to the trigeminal nerve. Most of the fibers from 

 it, however, are distributed as constituents of the palatine 

 nerves. For this reason, it has been found necessary to study 

 the ganglion itself and the nerves connected with it in any way. 



The sphenopalatine ganglion in the mouse is an elongated 

 mass of ganglion cells lying between the medial side of the max- 

 illary nerve and the medial wall of the orbit. It begins as a 

 small accumulation of cells along the ventral border of the nerve 

 of the pterygoid canal immediately after that nerve enters the 



