The keyhole of temporal base transtentorial approach is located on the supramastoid crest with the posterior rim on anterior angle of parietomastoid sutures .
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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 .
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The anterior portion of the supramastoid crest and zygoma root correlated with the level of the middle fossa .
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乳突上嵴