part of part of contributes to morphology of temporal bone petrous part of temporal bone subarcuate fossa In the temporal bone, above and between the aquæductus vestibuli is an irregular depression which lodges a process of the dura mater and transmits a small vein and the subarcuate artery[1] a branch of the internal auditory artery, which is an end artery that supplies blood to the inner ear ; in the infant this depression is represented by a large fossa, the subarcuate fossa, which extends backward as a blind tunnel under the superior semicircular canal. It is extensive in most primates (except for great apes) and nearly all mammals. In these animals, the subarcuate fossa houses a part of the cerebellum, the petrosal lobe[WP] FMA:56418 Wikipedia:Subarcuate_fossa The irregular depression found on the posterior inner surface of the petrous portion of the temporal bone just below its crest and above and lateral to the internal acoustic meatus[MP]. fossa subarcuata EMAPA:37967 UBERON:0003995 cranial fossa