Definition: collective term denoting a variety of fiber tracts descending to the spinal cord from the reticular formation of the pons and medulla oblongata. A portion of these fibers conduct impulses from the neural mechanisms regulating autonomic functions to the corresponding somatic and visceral motor neurons of the spinal cord; others form links in nonpyramidal motor mechanisms affecting muscle tonus, reflex activity, and somatic movement.
Synonym(s): tractus reticulospinalis
See Also: bulboreticulospinal tract, pontoreticulospinal tract
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