Medial: frontal bone, parietal bone, temporal bone, and sphenoid bone.
Lateral: Temporal fascia
Anterior: Posterior surface of the frontal process of the zygomatic bone and the posterior surface of the zygomatic process of the frontal bone.
Superior: Pair of temporal lines (superior and inferior temporal lines - see second diagram below) that arch across the skull from the zygomatic process of the frontal bone to the supramastoid crest of the temporal bone
Inferior: Zygomatic arch laterally and by the infratemporal crest of the greater wing of the sphenoid medially