Rubrospinal tract

Tract

Function

Origin

Crossed

Termination

Rubrospinal

Facilitates flexor and inhibits extensor muscle groups

Red nucleus

Yes; ventral tegmental decussation (in midbrain)

Intermediate gray and ventral horn

Feature

Involved in the maintenance of flexor tone
Fibers from red nucleus cross in the ventral tegmentum, travel anteriorly, and partially intermingle with the corticospinal tract to descend to laminas V, VI, and VII over the entire length of the cord.
Red nucleus input — both cerebral cortices and the contralateral cerebellar nucleus interpositus via superior peduncle, with somatotopic organization from cortex to the spinal cord Red nucleus stimulation — contralateral flexion and inhibition of extension

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