In the temporal bone at the sides of the skull, 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 a branch of the meatal segment of anterior inferior cerebellar 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.
^Gannon PJ, Eden AR, Laitman JT (Oct 1988). "The subarcuate fossa and cerebellum of extant primates: comparative study of a skull-brain interface". Am J Phys Anthropol. 77 (2): 143–64. doi:10.1002/ajpa.1330770202. PMID3207165.
^Jeffery N, Ryan TM, Spoor F (Aug 2008). "The primate subarcuate fossa and its relationship to the semicircular canals part II: adult interspecific variation". J Hum Evol. 55 (2): 326–39. doi:10.1016/j.jhevol.2008.02.010. PMID18395770.