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Arcuate nucleus (medulla)
Transverse section ofmedulla 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 [edit on Wikidata]

In themedulla oblongata, thearcuate nucleus is a group ofneurons located on the anterior surface of themedullary pyramids. These nuclei are the extension of thepontine nuclei.^[1]

They receive afferents from thecorticospinal tract.^{[citation needed]}

They in turn project efferents into thecerebellum through theinferior cerebellar peduncle as:^[1]

• theanterior internal arcuate fibers which pass along the midline before decussating near therhomboid fossa (floor of fourth ventricle) then passing laterally as themedullary striae;
• theanterior external arcuate fibers.

Arcuate nuclei are capable ofchemosensitivity and have a proven role in therespiratory center controlling thebreathing rate.^[2]

• 
  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.

• MedEd at LoyolaNeuro/frames/nlBSs/nl31fr.htm
• PubMed article

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