WILLARD: CRANIAL NERVES OF ANOLIS CAROLINENSIS. 49 
of the prodtic bone, being bounded anteriorly by the membranous 
part of the cranial wall (Plate 1, fig. 2; for. V). , 
Before the ganglion is reached, the root shows a distinct separation 
into three parts, which in cross section appear as three unequal seg- 
ments of a circle. The largest is the dorsal segment, which passes 
into the main part (gn. V) of the ganglion (semilunar of Fischer); 
the ventral comprises the motor neurons, while the median division 
from this point on is free from all other connections and passes into 
the ophthalmic ganglion (Plate 2, fig. 4; Plate 3, figs. 6,7, gn. V; gn. 
opth.). 
The motor components, thus segregated just proximal to the gan- 
glion, are almost exclusively distributed in small pure rami directly 
from the ganglion (Plate 3, fig. 6). A few motor fibers are, however, 
included in mandibular V and reappear in several small mixed rami 
innervating a part of m. mylo-hyoideus (Plates 2 and 8, figs. 5 and 6). 
Those rami which supply the dorsal and lateral jaw musculature 
arise from the dorsal division of the main motor bundle. This passes 
across the ventral side of the ganglion and the base of mandibular V 
to be split into two rami, one of which (cap. md. 1 and 2) supplies 
chiefly the m. capiti mandibularis, and the other (pt.) the greater 
part of the m. pterygoideus. Of the former a part passes directly 
dorsad, while the rest follows the course of maxillaris V as several 
slender rami to supply the anterior part of these muscles (Plates 2 
| and 8, figs. 4 and 6). 
The motor components which do not enter into this dorsal and 
lateral distribution pass directly cephalad on the ventral face of the 
ganglion. A part follows for a short distance mandibular V on its 
ventral side and then divides, one branch (pt-md.) going to innervate 
ithe m. pterygo-mandibularis, the other (pt.) to innervate the deeper 
part of the m. pterygoideus. The rest separates into three rami, two 
of which are very small. Of these one (pt-par.) innervates m. pterygo- 
parietalis, the other (pt-sph. p.) m. pterygo-sphenoidalis posterior. 
The third ramus (protrw. oc.) is larger than either of these two. It 
dasses cephalad to the orbit to innervate m. protrusor oculi and m. 
lepressor palpebrae inferioris. Because of its special functional and 
\tructural relations, this nerve demands a more detailed account. 
“Ramus ad m. depressor palpebrae inferioris (dep. palb. if.). This 
amus is recognizable on the ventral side of the main motor bundle 
[posite the proximal end of the ganglion (Plate 6, fig. 17). The 
undle as a whole has a characteristic appearance, the fibers being 
‘ell medullated but somewhat finer than those of the other motor 
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