195 
MR. YOUATT’s VETERINARY LECTURES. 
portion of bone, together with the divided integument, hung 
over the eye, so as to intercept vision. Be replaced the bone, 
brought the edges of the wound together, and confined them by 
pins of silver wire ; and although there was considerable inflam¬ 
mation for a while, the bones united, and the wound healed in a 
fortnight. 
There are numerous small foramina running along the edge 
of the superciliary ridge into which minute vessels dip to give 
nourishment to the bone; and a few T of them penetrate through 
the bone. Farther back is a larger hole, called the superciliary, 
or supra-orbital foramen, and through which the supra-orbital 
artery and nerve come out. The supra-orbital artery is a branch 
of the internal maxillary, given off from the bottom of the orbit, 
whence it climbs the inner and upper part of the roof, to reach 
this foramen, and supplies the skin and cellular membrane of the 
forehead, and anastamoses with the anterior auricular and tem¬ 
poral arteries; thus establishing a communication between the 
internal vessels of the orbits and the external ones of the temple 
and ear; it is soon lost in these anastamoses, and on the cel¬ 
lular membrane of the forehead. 
The nerve is a branch of the ophthalmic division of the fifth pair, 
given off likewise deep in the orbit, climbing the roof, and pass¬ 
ing through this foramen to be distributed over the forehead and 
upper eyelid; 
The orbital process terminates on the zygomatic arch in a kind 
of tuberosity, and contributes materially to the strength of that 
arch. Strength is there required. 
The eoronoid process of the low'er jaw r works within it. Its 
free motion must be defended; for if the horse cannot eat, he no 
longer lives. It is also a part much exposed to danger and 
injury. It would be sufficient to mention the brutal violence 
with which a tight collar is sometimes forced on: but I shall 
have more to say of the zygomatic arch when I have described 
the other bones w hich help to form it. 
I return to the inner angle of the eye, to which I have follow ed 
the connexions of the frontal bone. There it is in union with, and 
superior to, the upper external process of the lachrymal bone, 
which it seems to receive into a kind of curve, and to be united 
to it by a dove-tailed suture, and which deserves examination, 
for it is both a dove-tailed and a squamous one. The process of 
the lachrymal bone overlaps the frontal, effectually to secure this 
part of the orbit, and forms a curious contrast with the 'suture 
that occurs almost immediately afterwards between the frontal 
and nasal bones, w here there is only the lower part of the frontal 
sinus to protect. 
A small process of the frontal now runs between the lachrymal 
