Cross-forehead horizontal incision
For most procedures of the facial skeleton, the pericranium is incised horizontally across the forehead at a point 2-3 cm above the supraorbital ridges.
The incision extends from one superior temporal line to the other and subperiosteal dissection proceeds forward and downward.
An extension further laterally beyond the superior temporal line requires an incision through the periosteum of the zygomatic process of the frontal bone.
Such an extension releases the tension and facilitates tissue retraction necessary to expose the nasofrontal and supraorbital regions.