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Subarcuate fossa

Depression in the temporal bone in the skull of mammals From Wikipedia, the free encyclopedia

Subarcuate fossa
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The subarcuate fossa is a shallow[1] depression upon the internal surface of the petrous part of the temporal bone[2] forming the wall of the posterior cranial fossa. The fossa accommodates the flocculus of the cerebellum. It is situated lateral/posterior to the internal auditory meatus.[1]

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Anatomy

The subarcuate fossa is situated posteriorly[3]:568 and superiorly[3]:737 between the opening of the vestibular aqueduct and opening of internal auditory meatus.[3]:568, 737

The surface of the subarcuate fossa is lined with dura mater and lodges the endolymphatic sac and duct, as well as a minute artery and vein;[3]:568 some veins from the mucosa of mastoid antrum enter the cranial cavity at the subarcuate fossa to drain at the superior petrosal sinus - they are remnants of larger subarcuate veins of childhood and represent a possible route of intracranial infectious spread.[3]:749

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Other animals

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.[4][5]

References

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