orbital rim


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orbital margin

[TA]
the mostly sharp edge of the orbital opening that is the peripheral border of the base of the pyramidal orbit. The superior half of the orbital rim is the supraorbital margin; the inferior half is the infraorbital margin. The frontal, maxillary, and zygomatic bones contribute to the orbital rim, which is generally strong so as to protect the orbital contents. Weak potential fracture sites of the rim coincide with the sutures between the participating bones.

orbital rim

The anterior edge of the bony orbit, or eye socket, formed by the maxilla and zygomatic bone inferiorly and the frontal bone superiorly.
See also: rim
References in periodicals archive ?
When confronted with facial injury, the pattern of palpation is as follows: supraorbital and lateral orbital rims, infraorbital rims, malar eminences, zygomatic arches, nasal bones, maxilla and mandible.
An immediate CT was obtained, and it showed a new fracture line in the superomedial orbital rim (figure, B).
A sudden increase in pressure around the circumference of the orbital rim can result in a 'blow out fracture' in which there is damage to an orbital wall.
In this article, we report a case of dentigerous cyst of the maxilla and maxillary sinus that caused the ectopic displacement of an unerupted tooth into the orbital rim and floor.
With more force, the fracture progresses to involve the thick glabellar bone, the frontal sinuses, and the medial and inferior orbital rims.
The lateral nasal wall was removed endoscopically from the inferior orbital rim to the inferior turbinate to expose the lateral portion of the maxillary sinus.
Using a reciprocating saw, osteotomy of the outer table of the frontal bone and superior orbital rim was performed as close as possible to the lateral sinus margins.
The tarsal-strip procedure is designed to correct lid laxity by shortening the lower canthus and suspending it from the medial surface of the lateral orbital rim.
These procedures include lateral orbitotomy, (8) transconjunctival cryoextraction, (9) medial orbitotomy, (10) gamma-knife radiosurgery, (11) and anterior orbital rim incisions.
The patient underwent a complete excision of the mass followed by immediate reconstruction of the zygomnaxillary buttress and the orbital rim and floor.
Finally, the surgeon should be most careful not to point the trocar toward the orbit because this could result in blindness; it might be helpful to palpate the inferior orbital rim during the procedure to reinforce the limit of positioning.
Injections delivered outside the orbital rim have the shortest duration of action and the least effect, but they also cause the fewest side effects.