The inferior border, short, thick, and arched, has attached to it some fibers of the masseter.

The lateral surface is convex and subcutaneous. The medial surface is concave, and affords attachment to the masseter.

The anterior end is deeply serrated and articulates with the zygomatic bone. The posterior end is connected to the squama by two roots, the anterior and posterior roots:
* The posterior root, a prolongation of the upper border, is

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