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The cerebellar vermis (from Latin vermis, "worm") is located in the medial, cortico-nuclear zone of the cerebellum, which is in the posterior fossa of the cranium. The primary fissure in the vermis curves ventrolaterally to the superior surface of the cerebellum , dividing it into anterior and posterior lobes .
The cerebellum consists of three parts, a median and two lateral, which are continuous with each other, and are substantially the same in structure. The 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 hemispheres.
The local field potentials of the neocortex and cerebellum oscillate coherently at (6–40 Hz) in awake behaving animals. [11] These appear to be under the control of output from the cerebral cortex. [12] This output would be mediated by a pathway from layer 5/6 neurons in the neocortex through that project either to the pons or the inferior olive.
The superior cerebellar veins pass partly forward and medialward, across the superior cerebellar vermis. They end in the straight sinus, [1] and the internal cerebral veins, partly lateralward to the transverse and superior petrosal sinuses. The inferior cerebellar veins are larger.
On the superior aspect of cerebellum, the vermis protrudes above the level of the hemispheres, but on the inferior surface it is sunk almost out of sight in the bottom of a deep depression between them; this depression is called the vallecula of the cerebellum, and lodges the posterior part of the medulla oblongata and the inferior vermis, which consists of the tuber vermis, pyramid, uvula and ...
The nodule (nodular lobe), or anterior end of the inferior vermis, abuts against the roof of the fourth ventricle, and can only be distinctly seen after the cerebellum has been separated from the medulla oblongata and pons. On either side of the nodule is a thin layer of white substance, named the posterior medullary velum.
Diagram of the layers of the cerebellar cortex showing a glomerulus in the granular layer. Granule cells receive all of their input from mossy fibers, but outnumber them by 200 to 1 (in humans). Thus, the information in the granule cell population activity state is the same as the information in the mossy fibers, but recoded in a much more ...
The tuber of vermis, the most posterior division of the inferior vermis, is of small size, and laterally spreads out into the large inferior semilunar lobules, ...