orbital fat


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Related to orbital fat: orbital rim

orbital fat

a semifluid adipose cushion that lines the bony orbit supporting the eye. Selective loss of fatty tissue caused by hormonal imbalances may produce "bulging" of the eye. Traumatic loss of the fat causes a sunken appearance of the eye. Replacement of the fat by tumor or abnormal tissue may be discovered on ophthalmological examination. The examiner gently presses on the front of the eyes through the eyelids. Normally each eye may be displaced 0.5 cm into the socket.

orbital fat 

Fat (e.g. adipose tissue) which fills all the space not occupied by the other structures of the orbit (eyeball, optic nerve, muscles, vessels, etc.). It extends from the optic nerve to the orbital wall and from the apex of the orbit to the septum orbitale.

fat

1. the adipose or fatty tissue of the body.
2. neutral fat; a triglyceride (or triacylglycerol), which is an ester of fatty acids and glycerol (a trihydric alcohol). Each fat molecule contains one glycerol residue connected by ester linkages to three fatty acid residues, which may be the same or different. The fatty acids may have no double bonds in the carbon chain (saturated fatty acids), one double bond (monounsaturated), or two or more double bonds (polyunsaturated).

fat absorption test
assesses the absorptive capacity of the small intestine, quantitatively by measuring serum lipid levels or qualitatively by plasma turbidity, at timed intervals after the oral administration of fats.
animal fat
a most important abattoir by-product providing edible fat for the human food chain. Products include oleo oil and oleo stearin used in margarine manufacture and dripping for commercial baking. Nonedible fats go to leather dressings, glycerol manufacture and lubricants. Beef and pork fat are the valuable ones, mutton fat having too strong a flavor for edible fat.
boiling (burning) fat
see acrolein poisoning.
fat cattle
a class of beef cattle of any age but usually greater than one year, well-covered and judged ready for slaughter to provide prime cuts of beef.
fat cow syndrome
a syndrome of anorexia and ketonuria that occurs in overfat cows at calving. Precipitated by events that interfere with the cow's feed intake for even short periods. A poor response to treatment and many cows die.
Enlarge picture
Fatty liver in fat cow syndrome. By permission from Blowey RW, Weaver AD, Diseases and Disorders of Cattle, Mosby, 1997
crude fat
that part of a feed that is extractable by ether. Includes fat, oil, wax, resin and some pigments.
dietary fat
a rich source of energy for carnivores and omnivores and to a limited extent ruminants. Are usually too expensive for widespread use other than as excipients. They aid in the formation of pellets and in reducing dustiness. Their problem is a tendency to rancidification unless an antioxidant is added.
fat embolism
lesion created by a fat embolus.
fat embolus
globules of fat, sufficient to act as emboli occur usually after trauma or surgery, but can also occur in hyperlipemia, myositis and atherosclerosis.
fat ewe pregnancy toxemia
occurs when there is a voluntary restriction of food intake in late pregnancy associated with lack of ruminal expansion potential caused by excess abdominal fat and multiple fetuses. It is common in hobby sheep farms where it is thought that ewes should lamb with body condition scores greater than 4 rather than less than 3.5.
leaf fat
the best edible fat from a pig carcass, from under the peritoneum.
fat marbling
deposition of fat between muscle fibers. A highly desirable characteristic in beef. Is a guarantee of a carcass from a young animal.
fat necrosis
necrosis in which fat is broken down into fatty acids and glycerol, usually occurring in subcutaneous tissue as a result of trauma. See also lipomatosis.
orbital fat
fat located deep to the eyeball; substantial amounts provide good shock-absorbent surroundings.
perivaginal fat prolapse
during a difficult parturition in a fat cow or heifer perivaginal fat is pushed caudally and bursts through the vaginal wall into the vagina.
fat phanaerosis
conversion in the tissues of invisible fatty substances into fat which can be stained and thus become visible.
fat prolapse
see perivaginal fat prolapse (above).
fat sheep
a class of meat sheep of any age but usually greater than one year, well-covered and judged ready for slaughter to provide prime cuts of mutton.
References in periodicals archive ?
It was macroscopically evident that the revealed tissue was orbital fat.
The approach to treatment of HOF has frequently been to excise the "herniated fat" (1,2,4,5), but excision of the orbital fat may be difficult, and postoperative bleeding from the pedicle of the removed fat is a potential risk for a retrobulbar hematoma.
1) Magnetic resonance imaging often discloses hypointense signals in the eyelids that extend into the anterior orbital fat.
However, the histopathologic features of the malady include an infiltration of the thyroid gland, skin, extraocular muscles, and orbital fat by lymphocytes, macrophages, plasma cells, and mast cells along with mucopolysaccharides, instead of xanthoma cells and Touton giant cells.
Orbital fat and small vessels except a part of ophthalmic artery crossing optic nerve were removed.
8] Clinically, differential diagnosis of the osseous choristomas is broad and includes dermoid, prolapsed orbital fat, papillomas, dermolipomas, and complex choristomas.
The integrity of the surrounding lamina papyracea should be inspected to ensure the absence of any orbital fat dehiscence within the Haller cell.
2) Vascular: n=45 Excessive intraoperative 25 bleeding Postoperative packing 14 required Surgery terminated 6 Synechiae: n=28 Mildly symptomatic 11 or asymptomatic Symptomatic 17 Orbital: n=11 Violation of lamina papyracea 3 Orbital fat exposure 3 Orbital ecchymosis 3 Orbital subcutaneous air 2 Diplopia; epiphora 0 Miscellaneous: n=4 Anesthesia-related 2 Seizure 1 Asthma exacerbation 1 COPD exacerbation; tooth 0 pain; toxic shock syndrome Major complications: n=3 (0.