In the medulla oblongata, the arcuate nucleus is a group of neurons located on the anterior surface of the medullary pyramids. These nuclei are the extension of the pontine nuclei.[1]
They receive afferents from the corticospinal tract.[citation needed]
They in turn project efferents into the cerebellum through the inferior cerebellar peduncle as:[1]
- the anterior internal arcuate fibers which pass along the midline before decussating near the rhomboid fossa (floor of fourth ventricle) then passing laterally as the medullary striae;
- the anterior external arcuate fibers.
Function
Arcuate nuclei are capable of chemosensitivity and have a proven role in the respiratory center controlling the breathing rate.[2]
Additional images
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Diagram showing the course of the arcuate fibers. -
The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
External links
References
- ^ a b Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York: Elsevier. p. 445.e1. ISBN 978-0-7020-7707-4. OCLC 1201341621.
- ^ Paradiso, B; Ferrero, S; Thiene, G; Lavezzi, AM (November 2018). "Variability of the medullary arcuate nucleus in humans". Brain and Behavior. 8 (11): e01133. doi:10.1002/brb3.1133. hdl:11577/3281424. PMID 30329220.
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