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Arcuate nucleus (medulla)

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They receive afferents from the corticospinal tract.

They in turn project efferents into the cerebellum through the inferior cerebellar peduncle as:

  • 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.

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