Once the skin/muscle flap of tissue is elevated from the lower eyelid, it can be retracted inferiorly, extending below the inferior orbital rim. If no violation of the orbital septum occurred, one should see the tarsal plate above with the pretarsal portion of orbicularis oculi still attached, and the orbital septum below extending to the infraorbital rim. An incision through the periosteum on the anterior surface of the maxilla and zygoma, 2 to 3 mm below or lateral the orbital rim, can be made with a scalpel (Fig. 2-21). The incision through the periosteum at this level avoids the insertion of the orbital septum along the orbital margin. The infraorbital nerve is approximately 5 to 7 mm inferior
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