fossas,posterior cranial 《英文msh詞典》Fossas,Posterior Cranial ; [入口詞] Fossas,Posterior Cranial ; [主題詞] Cranial Fossa,Posterior ; [英文釋義] 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.