Step 3 Periosteal Incision

After undermining in the supraperiosteal plane, the skin is retracted until it is over the area of interest. Another incision through the periosteum completes the sharp dissection (Fig. 4-2).

Figure 4 2 Incision through periosteum along lateral orbital rim and subperiosteal dissection into lacrimal fossa. Because of the concavity just behind the orbital rim in this area, the periosteal elevator is oriented laterally as dissection proceeds posteriorly.

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