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| Cranial Fossa, Posterior Clivus | Cranial Fossas, Posterior | Fossa, Posterior Cranial | Fossas, Posterior Cranial | Posterior Cranial Fossa | Posterior Cranial Fossas The infratentorial compartment that contains the CEREBELLUM and BRAIN STEM. It is formed by the posterior third of the superior surface of the body of the sphenoid (SPHENOID BONE), by the occipital, the petrous, and mastoid portions of the TEMPORAL BONE, and the posterior inferior angle of the PARIETAL BONE. |