The nodule (nodular lobe), or anterior end of the inferior
vermis
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 s ...
, abuts against the roof of the
fourth ventricle
The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. These cavities, known collectively as the ventricular system, consist of the left and right lateral ventricles, the third ventricle, and the fourth ve ...
, and can only be distinctly seen after the
cerebellum
The cerebellum (Latin for "little brain") is a major feature of the hindbrain of all vertebrates. Although usually smaller than the cerebrum, in some animals such as the mormyrid fishes it may be as large as or even larger. In humans, the cerebel ...
has been separated from the
medulla oblongata
The medulla oblongata or simply medulla is a long stem-like structure which makes up the lower part of the brainstem. It is anterior and partially inferior to the cerebellum. It is a cone-shaped neuronal mass responsible for autonomic (involun ...
and
pons
The pons (from Latin , "bridge") is part of the brainstem that in humans and other bipeds lies inferior to the midbrain, superior to the medulla oblongata and anterior to the cerebellum.
The pons is also called the pons Varolii ("bridge of Va ...
.
On either side of the nodule is a thin layer of white substance, named the
posterior medullary velum.
It is semilunar in form, its convex border being continuous with the white substance of the cerebellum; it extends on either side as far as the
flocculus.
Additional Images
File:Slide2SEER.JPG, Cerebellum. Inferior surface.
File:Slide3EER.JPG, Cerebellum. Inferior surface.
File:Slide4SER.JPG, Cerebellum. Inferior surface.
External links
*
* https://web.archive.org/web/20010514005529/http://www.ib.amwaw.edu.pl/anatomy/atlas/image_11e.htm
Cerebellum
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