[any of several tracts whose fibers arise from cells in tegmental or reticular nuclei (reticular formation) of the brain stem and which descend into the spinal cord; these tracts have multiple functions, including motor coordination and the regulation of muscle tone; also regulates autonomic functions mediated through the spinal cord. ( CSP )]
UMLS (CSP) C0175558 - Body Part, Organ, or Organ Component
Relation/PAR: central neural pathway/tract