Supramastoid Crest Of The Temporal Bone, Lateral View

Description

Supramastoid crest (crista supramastoidea) runs along the superior margin of the mastoid part of the temporal bone, continuing posteriorly from the root of the zygomatic process on the lateral surface of the cranium. Inferior to the crest, the mastoid region expands toward the mastoid process, while anterior and slightly inferior lies the external acoustic meatus with the squamous part of the temporal bone extending superiorly. The ridge sits lateral to the petrous portion and marks a palpable transition between the flat temporal squama above and the thicker mastoid cortex below. A hard landmark. Otologic surgeons and trainees rely on the supramastoid crest when orienting to the superior extent of the mastoid during cortical mastoidectomy, because its relationship to the suprameatal region and the root of the zygoma helps establish the safe superior boundary before approaching the mastoid antrum and tegmen tympani. For anatomists, the crest also anchors discussion of temporalis fascia and adjacent muscle attachments along the temporal lines, connecting skull surface anatomy to function and to incisions used in postauricular and temporoparietal approaches. Consistent lateral lighting and the isolated bony context make the ridge’s curvature and its continuity with the zygomatic process easy to read without distraction from neighboring bones. Use this illustration in head and neck anatomy courses, surgical anatomy atlases, and ENT operative teaching materials that need a single, reliable lateral landmark on the temporal bone for preoperative planning diagrams and instrument orientation figures. It also fits radiology teaching documents that correlate palpable skull ridges with CT surface anatomy of the temporal squama and mastoid cortex. Anatomical accuracy verified by SciePro's Medical Advisory Board.