vermis

n., pl., -mes (-mēz).
The region of the cerebellum lying between and connecting the two hemispheres.

[New Latin, from Latin, worm.]

(vûr'mĭs)
n., pl. -mes (-mēz).

The narrow middle zone occurring between the two hemispheres of the cerebellum.

[L.] a worm, or wormlike structure.

• v. cerebelli — the median part of the cerebellum, between the two hemispheres.
• nodule of v. — the part of the vermis of the cerebellum, on the ventral surface, where the inferior medullary velum attaches.