Cerebellum's Semilunar Lobules, Superior View

Description

Cerebellar hemispheres dominate the superior aspect, with the semilunar lobules (crus I and crus II of the ansiform lobule) forming broad, gently convex cortical plates lateral to the vermis. The primary fissure arcs transversely across the superior surface, and the semilunar lobules lie posterior to it within the posterior lobe, separated from the more anterior superior semilunar region by intervening folia and shallow sulci. Midline vermian folia remain medial, while the hemispheric cortex expands laterally into the semilunar territory. Fissures define the map. Semilunar lobules matter because they anchor the modern functional discussion of cerebellar hemispheres, where lesions extend beyond classic limb ataxia to include dysmetria, oculomotor findings, and cerebellar cognitive affective syndrome when posterior lobe circuitry is involved. A superior perspective helps you track the primary fissure and the hemispheric-versus-vermian division that surgeons and neuroradiologists reference when localizing posterior fossa masses, subdural collections beneath the tentorium, or cerebellar infarcts in superior cerebellar artery territory. The smooth, flattened presentation of the lobular cortex makes the boundary posterior to the primary fissure easy to teach without getting lost in overly deep folial shadows. Use this illustration in gross neuroanatomy labs, cerebellar functional neuroanatomy lectures, and figure plates for neurology or neurosurgery texts that need a clean superior surface reference for crus I/II terminology. It also pairs well with MRI correlation sections when orienting axial and sagittal images to the posterior lobe landmarks used in lesion localization. Anatomical accuracy verified by SciePro's Medical Advisory Board.