MUSTKLUS L/EVlS. 171 



acquires this position a large branch becomes detached from 

 the dorsal surface of the nerve, and runs forward and 

 laterally directly internal to that portion of the buccalis that 

 goes to the infra-oi'bital organs 46 to 69 and to the buccal 

 group of ampullae. Two small branches arise from this 

 branch bctore it becomes entirely detached from the main 

 truuk, and running forward, dorsal to the buccalis and 

 ventral to the peri-orbital sinus, reach the ventral surface of 

 the antorbital process of the skull, being closely accom- 

 panied in their course by a branch of the posterior carotid 

 artery. The main branch, after it becomes detached from 

 the maxillaris, sends several branches to the tissues antero- 

 ventral to the eye, certain of them accompanying certain of 

 the buccalis branches that go to infra-orbital organs 46 to 69. 

 The remaining portion of the main branch then separates 

 into two parts, both of which run forward along the lateral 

 surface of Add/3, and beyond the anterior edge of the dorsal 

 head of that muscle lie, one along the ventro-lateral corner 

 of the nasal capsule, and the other in the angle between that 

 capsule and the side "wall of the brain case. The ventral 

 branch here lies directly internal to and accompanies the 

 subrostral section of the supra-orbital canal, a maxillaris 

 branch of the trigeminus tlius here being associated with the 

 ophthalmic lateral canal. 



The large branch just above described is given oft' from the 

 dorsal surface of the maxillaris. At about the same time two 

 branches become detached, one from the ventral surface of 

 each of the two branches into which the buccalis separates 

 after having given off the branches to the buccal group of 

 ampulla). These two branches, although having their appa- 

 rent origins from the two branches of the buccalis, are 

 maxillaris and not buccalis nerves, but they become detached 

 from the maxillaris and intimately associated with the buccalis 

 a very considerable distance posterior to this point, while 

 the main nerves are still on the floor of the orbit. Like the 

 other maxillary branches that leave the nerve in that part of 

 its course, they pass along the ventral aspect of the buccalis 



