162 EDWARD PHELPS ALLIS, JtJN. 



and forward, ventral to the buccalis^ and then upward along 

 the lateral surface of that nerve. They thus come to lie 

 along the dorso-lateral edge of the buccalis, between it and 

 the mandibularis, and from that position they later run to 

 the regions they inuervate. The ramus mandibularis thus 

 here begins to become detaclied from the remainder of the 

 truncuSj and shortly before reaching the point where the 

 palato-quadrate cartilage articulates with the antorbital part 

 of the skull, it runs outward over the dorsal edge of the 

 palato-quadrate cartilage, and then downward and backward, 

 at first lying along the lateral, external surface of the 

 adductor mandibulfe muscle, but gradually becoming im- 

 bedded in the fibres of that muscle. 



The remaining portion of the truncus now represents the 

 united maxillaris trigemini and buccalis facialis. It turns 

 more directly forward, and passes lateral to the articular 

 process of the palato-quadrate, there lying at first along 

 the dorsal edge of the dorso-anterior corner of the adductor 

 mandibulse muscle, but soon turning downward and forward 

 to reach the lateral surface of the muscle Add/3 of Vetter's 

 descriptions (63). Here both of the nerves immediately 

 give off numerous branches, which, united more or less 

 completely, seem to form a large and important outer 

 division of the truncus. This division, however, immediately 

 breaks up into numerous branches, some destined to innervate 

 the sense organs of the infra-orbital canal, others to innervate 

 the general tissues, and still other and more important ones 

 to innervate the sense organs of the buccal group of ampulla?. 



The remaining portion of the truncus has now reached 

 the lateral edge of the head, and here turns mesially, forward 

 and downward on to its ventral surface, still lying along the 

 external surface of the muscle Addj3, that surface here 

 being presented ventro-laterally. Continuing its course in 

 this position, it soon passes beyond the level of the anterior 

 end of the palato-quadrate cartilage, and reaches the level of 

 the hind end of the nasal capsule. It there still lies ventro- 

 lateral to, and along the external surface of, the muscle 



