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Cerebellar Arteries, Brainstem, and Cerebellar-Brainstem Fissures

Surgical Correlation

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E, The SCA passes above the trigeminal nerve and enters the cerebellomesencephalic fissure, where it sends branches down the superior peduncle to the dentate nucleus. The PICA passes between the vagus and accessory nerves and courses on the inferior peduncle to reach the cerebellomedullary fissure. F, Enlarged view of the lateral recess. The flocculus and choroid plexus project laterally from the margin of the foramen of Luschka into the cerebellopontine angle, behind the glossopharyngeal and vagus nerves and above the PICA. The hypoglossal rootlets arises from the medulla in front of the glossopharyngeal and vagus nerves and cross the posterior surface of the vertebral artery. Some hypoglossal rootlets pass above and others below the PICA origin. (Images courtesy of AL Rhoton, Jr.)

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