ELEDONE. 5389 
nerve of the corresponding side (fig. 70 Ant. Sup. oph.). 
The most anterior of these pierces the cranial cartilage and 
so enters the orbit, and runs for a short time along its 
inner wall. Then, piercing the muscles of the eyeball, it 
runs external to this out to the eyelid, where it ends in 
several fine branches (fig. 74, Ant. Sup. oph.). The two 
posterior nerves are motor only. Piercing the cranial 
wall, and entering the orbit, they are distributed to the 
dorsal region of the muscles of the eyeball. 
B. (1) The Posterior Superior Ophthalmic (fig. 74, 
Post. Sup. oph.) is a rather stout nerve, arising from the 
postero-dorsal angle of the visceral ganglion, anterior 
to the pallial nerve (fig. 70). Running outwards, this 
nerve penetrates the cranial wall and so enters the orbit. 
Here it runs internally to the wall of the orbit, and 
external to the white body for a short time, and soon 
expands into a small oval ganglion. Piercing the 
muscular wall of the eyeball, it runs over its outer surface 
(fig. 74, Post. Sup. oph.), and finally ends in several 
branches which are distributed to the eyelid. 
B. (2) The Inferior Ophthalmic are three nerves 
on each side, of which the posterior is the least and is 
purely motor, being distributed to the inferior muscular 
wall of the eyeball. All three nerves, arising from the 
lateral face of the sub-oesophageal ganglionic mass, rather 
in front of the median line, run outwards and enter the 
orbit after piercing the cranial wall. The anterior nerve, 
after running for a time on the inner wall of the orbit, 
pierces this, and then runs along its outer wall to the 
eyelid, where it ends in several fine branches. The 
median nerve of the three is the largest and has a course 
similar to that of the posterior superior nerve. Like this, 
it bears a ganglion, but runs over the antero-inferior 
surface of the eyeball (fig. 75, Inf. oph. NV.). 
