128 | ANTHROPOLOGY. 
5. THe TRIGEMINI: TRIFACIAL. Firru Parr. This emerges. by three 
roots from the side of the pons Varolii, just where it is continuous with the 
crus cerebelli, and after forming the semilunar or Gasserian ganglion, is 
divided into three large branches, the ophthalmic, the ata and the 
inferior maxillary. 
The ophthalmuc passes along the outer side of the cavernous sinus, and 
approaching the foramen lacerum orbitale, divides into three beanehes the 
lachrymal, the frontal, and the nasal. The lachrymal is ultimately distri- 
buted to the conjunctiva and lachrymal gland. The /rontal divides into an 
internal or supra-trochleator nerve, to the region of the eye, and the external, 
supra-orbital, or proper frontal nerve, to the scalp. Both the frontal and 
lachrymal are nerves of sensation. The nasal nerve divides into two 
branches, the external or infra-trochleator to the lachrymal passages and the 
region of the nose, and the znternal or proper nasal. 
The superior maxillary nerve is larger than the ophthalmic, and passes from 
the middle of the ganglion forwards through the foramen rotundum into the 
pterygo-maxillary fossa. Here it sends down two small branches, which 
ultimately unite in the spheno-palatine ganglion or the ganglion of Meckel. 
From this proceed three sets of branches, an inferior, internal, and posterior. 
The inferior or palatine nerves are distributed to the palate and uvula. The 
internal branch, or the spheno-palatine nerve, divides into several branches 
after passing into the upper and back part of the nose; the principal of 
these is the naso-palatine nerve or nerve of Cotunnius. The third or posterior 
branch of the ganglion is the vidian or superior petrosal nerve, distributed to 
the tympanic apparatus. * 
Other branches sent off by the superior maxillary are, the orbzal, the 
malar, the temporal, the posterior dental, the ifra-orbital, and the anterior 
dental, all of which indicate their eye aoe in their names. 
The inferior maxillary nerve descends from the ganglion through. the 
foramen ovale into the zygomatic fossa, where it divides into two large 
branches, a superior or external, and an wmferior or internal. The former sub- 
divides into the two deep temporal, the masseteric, the buccal and the ptery- 
goid; the latter into the auricular, inferior dental, and gustatory nerves ; most 
of these have various subdivisions. 
6. Moror Externus Ocuti. SrxtH Parr. This arises from the base or 
upper portion of the corpus pyramidale, under the posterior margin of the 
tuber annulare, or pons; the fibres are assembled into two roots, of which 
the external is much the larger. These roots, uniting, pass through the 
sphenoidal foramen, and are distributed to the abductor oculi muscles. 
7a. FactaL NERVE OR Portio DuRa« OF THE SEVENTH Parr. This arises 
by two branches; the larger from the medulla oblongata, at the most supe- 
rior part of the corpus restiforme; the smaller from that portion of the 
medulla oblongata placed between the first branch and the auditory nerve. 
The two branches are kept distinct for the distance of several lines, when 
they unite, and, passing into the meatus auditorius internus and through the 
aqueduct of Fallopius, emerge at the stylo-mastoid foramen, to be distributed 
upon the muscles and skin of the head. In the aqueduct of Fallopius it 
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