Along the midline, between the cerebellar hemispheres is a narrow band of cortex known as the: the vermis.
The medial, cortico-nuclear zone of the cerebellum, which lies in the posterior fossa of the cranium, is where the cerebellar vermis—whose name comes from the Latin vermis, "worm"—is situated. The cerebellum is split into anterior and posterior lobes by the major fissure in the vermis, which curves ventrolaterally to the superior surface of the brain.
The vermis serves as a functional component of posture and movement. Through ascending spinal pathways, the vermis, which is a component of the spinocerebellum, receives somatic sensory information from the head and nearby body parts. The vermis is formed in the midline rostral areas of the cerebellum, while the cerebellar hemispheres are formed in the caudal rostral portions.
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