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Arcuate nucleus (medulla)
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This article is about the structure in the medulla oblongata. For the hypothalamic structure, see Arcuate nucleus.
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]
Quick Facts Details, Identifiers ...
Arcuate nucleus (medulla) | |
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![]() Transverse section of medulla oblongata below the middle of the olive. ("Nucleus arcuatus" visible near bottom right.) | |
![]() Dissection of brain-stem. Lateral view. (Labels for "External arcuate fibers" and "Dorsal external arcuate fibers" visible at lower right.) | |
Details | |
Identifiers | |
Latin | nucleus arcuatus medullae oblongatae |
NeuroNames | 775 |
NeuroLex ID | birnlex_2635 |
TA98 | A14.1.04.256 |
TA2 | 6016 |
FMA | 72609 |
Anatomical terms of neuroanatomy |
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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.