180 KDWARD PHELPS ALLIS, JUN. 



were tliere lost, Whetliei' or not tliey issued from tlie muscle 

 and supplied other tissues could uot be definitely deter- 

 mined. 



The other portion of the ramus mandibularis runs down- 

 ward^ backward, and mesial ly, until it passes the transverse 

 level of the hind corner of the gape of the mouth, where it 

 issues on the ventral surface of the adductor muscle, and, 

 turning forward and mesially, immediately passes from the 

 outer surface of the superior division of the muscle on to the 

 outer surface of the inferior, or mandibular division. This 

 nerve, in this part of its course, is certainly shown in the 

 nerve marked V3 in Tiesing's figure 9, in which figure the 

 nerve would seem to be cut. But how this ventral part of 

 this nerve unites with the dorsal part it is impossible to tell 

 from the figure; and the mandibularis externus facialis is 

 apparently not shown at all, certainly not in its proximal 

 portion. I am accordingly unable to here make any com- 

 parison with his work. 



When the ramus mandibularis reaches the outer surface of 

 the inferior division of the adductoi*, it sends one or more 

 small branches along the external surface of the united 

 adductor muscles, and a large branch downward and mesially, 

 internal to the mandibularis externus facialis, along the 

 external surface of the inferior division of the adductor. This 

 last branch sends two branches forward along the external 

 surface of the adductor, and itself, close to the mesial edge of 

 that muscle, pierces a well-differentiated intermandibularis 

 muscle, which Tiesing neither describes nor shows in his 

 figures. As it traverses this intermandibularis muscle, the 

 nerve turns dorsally and backward around the ventro-mesial 

 edge of the mandibular cartilage, and reaches the dorsal, or 

 internal, surface of the intermandibularis muscle, near its 

 lateral edge. There it continues backward, sends certain 

 branches into the muscle, and, for a certain distance, 

 diminishes in size. Then it begins to increase in size again, 

 and becomes the terminal part of the ramus hyoideus facialis. 

 These two nerves thus run directlv into each other, and anas- 



