Noun
vermis (plural vermes)
(anatomy) A narrow, worm-like structure found in animal brains between the hemispheres of the cerebellum; it is the site of termination of the spinocerebellar pathways that carry subconscious proprioception.
Like the cerebral cortex, the cerebellum is divided into two hemispheres; it also contains a narrow midline zone (the vermis ). Source: Internet
Superior view of an "unrolled" cerebellum, placing the vermis in one plane. Source: Internet