ABSTRACT
ANATOMY The orbit, or enclosure for the eye and associated muscles, nerves, and vasculature, is the conical cavity outlined by the periorbita. The orbit is incompletely encased in bone laterally and ventrally in all domestic animals. The bones that form the orbit in the dog, cat, and cow are: the frontal, lacrimal, zygomatic, maxilla, presphenoid, basisphenoid, and palatine bones (6.1, 6.2). In the horse, the squamous portion of the temporal bone also contributes to the orbit. The horse and cow have a complete bony orbital rim, whereas in the cat and dog the lateral orbital rim is formed by the orbital ligament (6.1, 6.2).
