VAN 121: Veterinary Gross Anatomy-II (2+2)

PERI ORBITA

• It is a conical fibrous sheath that encloses the eyeball with muscles, vessels and nerves.
• Its apex is attached around the optic and orbital foramina and its base is in part attached to the bony rim of the orbit, in part continues with the fibrous layer of the lids.
• Its medial part is in contact with the orbital wall, is thin; incorporated with it beneath the root of the supraorbital process is the bar of cartilage around which the superior oblique muscle is reflected.
• The lateral part is thicker and is strengthened by an elastic band that is attached to the pterygoid crest and furnishes origin to the thin, unstriped orbital muscle.
• A quantity of fat that lies about the periorbita and within it is the intra-orbital adipose tissue, which fills the interstices between the eyeball, muscles, etc.
• The orbital muscles have been studied under myology. The orbit has been studied in osteology.