390 HOWARD AYERS 
two nerves as they are being made ready for their peripheral 
distribution. 
As the drawing shows—and great care was taken to reproduce 
accurately the number, relative size, and the course of the nerve 
bundles present in this individual as seen from the ventral sur- 
face—a large addition is made to the mandibular nerve bundles 
from the fibers which leave the brain in the maxillary trunk. 
Between x, which is a part of the maxillary trunk, and z, the 
mandibular trunk, a thin band of fibers running apparently 
from the latter to the former, is shown in the small insert at 
the side. Two anastomoses with the ophthalmic trunk are 
also shown. The method of branching to the dermal structures 
is shown in figure 35. The maxillary nerve is also connected 
up to the jaw plexus in the snout region. In figure 35, at D, 
are shown four considerable branches which run from the trunk 
direct to the skin. Besides innervating a number of muscles 
of the jaw apparatus, it furnishes much material to the sensory 
jaw plexus. It also innervates the velum by atleast two branches. 
It is particularly the nerve of the distal portion of the jaw appara- 
tus, both motor and sensory, sharing with the ophthalmic in 
this control. It shares with the VII the control of the hyoidean 
apparatus. 
‘The mandibular nerve is not gathered into a single trunk in 
any part of its course. The main part of it leaves the medulla 
laterad of the maxilla, is closely applied to it and tied to it by 
anastomoses. 
Another part leaves the trunk of the maxillary nerve as a thin 
band of fibers issuing from the dorsomesial surface near the 
edge and wrapping around the ventral face of the trunk to run 
laterad across it to join the main nerve, as shown in figure 35. 
One division of the veloquadratus muscle is soldered to the 
maxillary nerve at this place (fig. 35, v.q.). The mandibular 
innervates the dentigerous jaw or basal portion of the ancestral 
jaw bar, also the mandibular muscles, both retractors and pro- 
tractors, and the muscles controlling the anterior part of the 
hyoidean apparatus or the Jaw-supporting mechanism, as well 
as supplying the skin structures of its territory. As figure 
