The anterior portion of the supramastoid crest and zygoma root correlated with the level of the middle fossa .

颧弓、 乳突 上 嵴 与其 相对 应的颅中窝底 相平。

The keyhole of temporal base transtentorial approach is located on the supramastoid crest with the posterior rim on anterior angle of parietomastoid sutures .

颞底经小脑幕手术入路骨窗为：第1孔（关键孔）位于 乳突上嵴上（ 后端），孔的后缘与顶 乳突缝前角 相切。

The relationships of the level of the bottom of the middle fossa with the supramastoid crest and the superior rim of zygoma arch were examined .

观察颧弓上缘、 乳突 上 嵴与颅中窝底的关系。