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Inferior cerebellar peduncle

Structure in the human brain

Summary

Structure in the human brain

Field	Value
Name	Inferior cerebellar peduncle
Latin	pedunculus cerebellaris inferior
Image	Gray677.png
Caption	Scheme showing the connections of the several parts of the brain. (Inferior peduncle labeled at bottom right.)
Image2	1612 Cerebellar Peduncles-02.jpg
Caption2	Inferior cerebellar peduncle shown with the two other cerebellar peduncles

The inferior cerebellar peduncle is formed by fibers of the restiform body that join with fibers from the much smaller juxtarestiform body. The inferior cerebellar peduncle is the smallest of the three cerebellar peduncles.

The upper part of the posterior district of the medulla oblongata is occupied by the inferior cerebellar peduncle, a thick rope-like strand situated between the lower part of the fourth ventricle and the roots of the glossopharyngeal and vagus nerves.

Each inferior cerebellar peduncle connects the spinal cord and medulla oblongata with the cerebellum, and comprises the juxtarestiform body and restiform body.

Important fibers running through the inferior cerebellar peduncle include the dorsal spinocerebellar tract and axons from the inferior olivary nucleus, among others.

Function

The inferior cerebellar peduncle carries many types of input and output fibers that are mainly concerned with integrating proprioceptive sensory input with motor vestibular functions such as balance and posture maintenance. It consists of fibers from the four spinocerebellar tracts that enter the cerebellum:

Posterior spinocerebellar tract: unconscious proprioceptive information from the lower part of trunk and lower limb. This tract originates at the ipsilateral Clarke's nucleus (T1-L1) and travels upward to reach the inferior cerebellar peduncle and synapses within the spinocerebellum (also known as the paleocerebellum).
Cuneocerebellar tract: unconscious proprioceptive information from the upper limb and neck. This tract originates at the ipsilateral accessory cuneate nucleus and travels through the inferior cerebellar peduncle to reach the spinocerebellum part of the cerebellum.
Trigeminocerebellar tract: unconscious proprioceptive information from the face.
Olivocerebellar tract: "error signal" in movement originates from the cerebral cortex and spinal cord. This tract originates at contralateral inferior olivary nucleus and enters the cerebellum as a climbing fiber.
Vestibulocerebellar tract: vestibular information projects onto the vestibulocerebellum (also known as the archicerebellum). This peduncle also carries information leaving cerebellum: from the Purkinje cells to the vestibular nuclei in the dorsal brainstem located at the junction between the pons and medulla oblongata.

Additional images

File:Gray691.png|Dissection of brain-stem. Dorsal view. File:Gray699.png|Diagram showing the course of the arcuate fibers. File:Lower pons horizontal KB.svg|Cross section of lower pons showing part of the inferior cerebellar peduncle (#8) labeled at the upper left. File:Slide2SEER.JPG|Cerebellum. Inferior surface.

References

(2018). "Fundamental neuroscience for basic and clinical applications". Elsevier.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

brainstem cerebellar-connections

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