Cerebellar vermis

The cerebellum median portion is constricted, and is called the vermis, from its annulated appearance which it owes to the transverse ridges and furrows upon it; the lateral expanded portions are named the cerebellar hemispheres.

see Tuber vermis.

The inferior vermis lies in a deep vertical depression in the suboccipital surface called the posterior cerebellar incisura, which also contains the falx cerebelli. The inferior vermis forms the posterior cortical surface within this incisura. In contrast, the superior vermis is the highest point on the cerebellum, occupying the space under the straight sinus where the tentorial leaflets intersect with the falx cerebri. The superior vermis slopes downward from its apex anteriorly to the posterior cerebellar incisura. The tentorial part of the vermian surface includes (from anterior to posterior) the culmen, declive, and folium. The suboccipital part of the vermian surface includes (from superior to inferior) the tuber, pyramid, uvula, and nodule. The nodule is hidden deep to the uvula.

Group 4 medulloblastoma is one of the most common pediatric brain tumors. They are the most common medulloblastoma group (followed by Group 3 medulloblastoma, Medulloblastoma, SHH-activated, and Medulloblastoma, WNT-activated), and typically arise from the Cerebellar vermis.