744 TTS: [Vou. XII. 
from that same ganglion, but as a part of the ramus buccalis. 
The ophthalmicus superficialis innervates the sense organs 
of the supraorbital sensory canal, and the anterior head line 
of pit organs; the buccalis innervates the sense organs of 
the suborbital and antorbital parts of the main infraorbital 
canal; and the oticus, the otic part of that canal, and the 
sense organ of the spiracular canal. 
15. The ramus ophthalmicus superficialis trigemini arises, 
in young larvae, from the upper, anterior end of the main 
trigemino-facial ganglion, but many of its fibres can be traced 
backward to the superficial portions of the median portion of 
the ganglion. They accordingly belong to the fasciculus com- 
munis portion of the posterior root of the ganglion, and not 
to the anterior root. The nerve is concerned largely in the 
innervation of the terminal buds found on the top of the head 
and snout, and its branches are sent to the outer surface of the 
head on both sides of the ophthalmicus facialis, which nerve it 
closely accompanies, lying immediately beneath it. 
16. The truncus maxillaris trigemini arises directly from the 
anterior commissure of the main trigemino-facial ganglion, but 
receives important additions to its fibres from the median, 
fasciculus communis portion of that ganglion. From it arise 
the rami maxillaris superior and inferior, and from it, also, or 
from the main ganglion itself, several accessory trigeminal 
nerves which seem destined to supply the terminal buds on 
the side of the cheek. 
17. The ramus maxillaris superior trigemini closely accom- 
panies the buccalis facialis in its course forward, behind, and 
below the eye. It lies immediately internal to and below the 
buccalis, its branches are given off on both sides of that nerve, 
and from its distribution it seems destined in part to the inner- 
vation of terminal buds. Its branches form anastomoses both 
with the posterior and the anterior portions of the ramus 
palatinus facialis. 
18. The ramus maxillaris inferior trigemini innervates all 
the levator and adductor muscles of the mandibular arch, the 
dilatator operculi, and probably also the intermandibularis, and 
all, or a part of, the inferior division of the geniohyoideus. 

