Middle cerebellar peduncle

Middle cerebellar peduncle
Dissection showing the projection fibers of the cerebellum. (Middle peduncle labeled at upper right.)
Details
Identifiers
Latinpedunculus cerebellaris medius
MeSHD065837
NeuroNames620
NeuroLex IDbirnlex_1529
TA98A14.1.05.003
A14.1.07.416
TA25848
FMA72515
Anatomical terms of neuroanatomy

The middle cerebellar peduncle (or brachium pontis) is a paired structure of the brain. It connects the pons to the cerebellum, with fibres originating from the pontine nucleus and travelling to the opposite hemisphere of the cerebellar cortex. It is supplied by the anterior inferior cerebellar artery (AICA) and branches from the basilar artery. It conveys information from the cerebrum and the pons to the cerebellum.

Structure

The middle cerebellar peduncle is the largest of the three cerebellar peduncles. It connects the pons and cerebellum. It consists almost entirely of fibers passing from the pons to the cerebellum (fibrocerebellar fibers); the fibers arise from the pontine nuclei and decussate within the pons before entering the peduncle to end in the contralateral hemisphere of the cerebellar cortex.

The fibers of the middle cerebellar peduncle are arranged in three fasciculi: superior, inferior, and deep.

  • The superior fasciculus, the most superficial, is derived from the upper transverse fibers of the pons; it is directed backward and lateralward superficial to the other two fasciculi, and is distributed mainly to the lobules on the inferior surface of the cerebellar hemisphere and to the parts of the superior surface adjoining the posterior and lateral margins.
  • The inferior fasciculus is formed by the lowest transverse fibers of the pons; it passes under cover of the superior fasciculus and is continued downward and backward more or less parallel with it, to be distributed to the folia on the under surface close to the vermis.
  • The deep fasciculus comprises most of the deep transverse fibers of the pons. It is at first covered by the superior and inferior fasciculi, but crosses obliquely and appears on the medial side of the superior, from which it receives a bundle; its fibers spread out and pass to the upper anterior cerebellar folia. The fibers of this fasciculus cover those of the inferior cerebellar peduncle.

The trigeminal nerve (CN V) arises from the lateral pons very close to the middle cerebellar peduncle.

Blood supply

The middle cerebellar peduncle is supplied by the anterior inferior cerebellar artery (AICA), as well as smaller branches from the basilar artery.

Function

The middle cerebellar peduncle conveys information from the cerebrum and the pons to the cerebellum.

Clinical significance

Infarction of the anterior inferior cerebellar artery (AICA) can damage the middle cerebellar peduncle. Diffuse intrinsic pontine glioma may spread from the pons into the middle cerebellar peduncle.

Additional images

See also


This page was last updated at 2024-04-17 15:59 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.


Top

If mathematical, chemical, physical and other formulas are not displayed correctly on this page, please useFirefox or Safari