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Superior cerebellar peduncle

Superior cerebellar peduncle
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Sagittal section of the cerebellum, near the junction of the vermis with the hemisphere. (Superior peduncle labeled at upper right.)
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Dissection showing the projection fibers of the cerebellum. (Superior peduncle labeled at center top.)
Details
Latin pedunculus cerebellaris superior
Identifiers
Gray's p.792
NeuroNames ancil-1289712953
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Dorlands
/Elsevier
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Anatomical terms of neuroanatomy

The superior cerebellar peduncle (brachium conjunctivum) is that structure that connects cerebellum to the midbrain. It consists mainly efferent fiber from the cerebellum to thalamus and red nucleus; and also afferent fiber from ventral spinocerebellar tract to cerebellum. It emerges from the upper and medial part of the white matter of each hemisphere and is placed under the cover of the upper part of the cerebellum.

Structure

They are joined to each other across the middle line by the anterior medullary velum, and can be followed upward as far as the inferior colliculi, under which they disappear.

Below, they form the upper lateral boundaries of the fourth ventricle, but as they ascend they converge on the dorsal aspect of the ventricle and thus assist in forming its roof.

Decussation

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Deep dissection of brain-stem showing decussation

The decussation of superior cerebellar peduncle is crossing of the superior cerebellar peduncle into the midbrain. It comprises the cerebellothalamic tract, which arises from the dentate nucleus (therefore also known as dentatothalamic tract), as well as the cerebellorubral tract, which arises from the globose and emboliform nuclei and project to the contralateral red nucleus to eventually become the rubrospinal tract. It is also known as horseshoe-shaped commissure of Wernekinck.[1] It is important as an anatomical landmark, as lesions above it cause contralateral cerebellar signs, while lesions below it cause ipsilateral cerebellar signs.

Function

The ventral spinocerebellar tract enters the cerebellum through the superior cerebellar peduncles, which otherwise mostly contain efferent fibres.


Additional images

External links

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. ^ Voogd J, van Baarsen K (February 2014). "The horseshoe-shaped commissure of Wernekinck or the decussation of the brachium conjunctivum methodological changes in the 1840s". N. Cerebellum 13 (1): 113–20. PMID 24078481. doi:10.1007/s12311-013-0520-9. 

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