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 ?
However, forward movement is limited by the medial and lateral canthal tendons that attach the eyelids to the bony orbital rim.
If there is no improvement within a few minutes, the surgeon should consider proceeding with disinsertion of the superior canthal tendon, followed by transconjunctival or transcutaneous division of the orbital septum from its attachment to the orbital rim.
Through the lesion itself, the crown of an impacted tooth, locked solidly into the orbital rim and floor, was palpated.
The lower canthal tendon is stretched to the orbital rim so that the surgeon can estimate the amount of shortening required for proper lid tension (figure 1, B).
Our examination revealed the presence of an isolated, firm, 4-cm mass in the right zygomatic arch that extended to the lateral aspect of the inferior orbital rim.
Injections delivered outside the orbital rim have the shortest duration of action and the least effect, but they also cause the fewest side effects.
His injuries included significant left orbital injury resulting in a ruptured, blind eye and severely comminuted fractures of the left orbital roof, superior and inferior orbital rims, and orbital floor.