THE PERIPHERAL NERVOUS SYSTEM. 371 
pulley to near the middle of the supraorbital crest of the frontal 
bone. Here it passes out of the orbit and is distributed to the 
integument of the upper eyelid and the adjacent region at the 
side of the nose. 
6. N. infratrochlearis.—The infratrochlear nerve passes 
between the superior rectus and: the superior oblique in the first 
part of its course. It then passes ventrad of the superior 
oblique and ventrad of the pulley to be distributed to the in- 
tegument of the upper eyelid near the inner angle. 
c. N. ethmoidalis.—The ethmoidal nerve passes along 
with the ethmoidal artery through the ethmoidal foramen (or 
foramina) in the orbital plate of the frontal bone. It is finally 
distributed to the mucosa of the nose and to the cartilage and 
integument of the snout. 
ad. N. ciliaris longus.—The long ciliary nerve arises from 
the ophthalmic and passes along the optic nerve to be dis- 
tributed to the eyeball. It divides into several branches before 
penetrating the sclerotic. 
One or two small communicating branches to the ciliary 
ganglion are given off at about the same point as the long 
ciliary nerve. (For a description of this ganglion see the 
account of the oculomotor nerve, page 369.) 
2. N. maxillaris.—The maxillary nerve, the second divi- 
sion of N. trigeminus, rises from the semilunar (Gasserian) 
ganglion and leaves the skull by the foramen rotundum. It 
is the sensory nerve of the palate, upper teeth and upper lip, 
and of part of the forehead and cheek. 
On leaving the foramen the maxillary nerve divides into 
three branches, the two infraorbital nerves (Fig. 154, 7) and 
the sphenopalatine (Fig. 154, g). Two smaller branches are 
likewise given off either within or just outside of the foramen, 
the lachrymal nerve (Fig. 154, 7) and the zygomatic (sub- 
cutaneus malz) (Fig. 154, 2). 
a. N. lachrymalis (Fig. 154, 7; Fig. 155, #).—The 
lachrymal nerve passes along the periorbita to the lachrymal 
gland (Fig. 154, 11), to which it gives branches. It then con- 
tinnes candad of the zvoamatic nroacess of the temnoral to the 
