The rubrospinal tract is a part of the nervous system.

In humans, the rubrospinal tract is one of several major motor control pathways.

A moderate density was observed in the following regions: the rubrospinal tract (Fig.

The first is the disinhibition of the red nucleus with facilitation of the rubrospinal tract.

This nucleus is the origin for the rubrospinal tract that mainly influences limb flexor muscles.

It is hypothesized that it uses both the corticospinal tract and rubrospinal tract.

However, where the corticospinal tract is dominant, the rubrospinal tract may be considered to be vestigial.

The rubrospinal tract facilitates motor neurons in the cervical spinal cord supplying the flexor muscles of the upper extremities.

These are the rubrospinal tract, the vestibulospinal tract, the tectospinal tract and the reticulospinal tract.

The rubrospinal tract descends with the lateral corticospinal tract, and the remaining three descend with the anterior corticospinal tract.

Upper motor neurons (UMNs) send input to α-MNs via several pathways, including (but not limited to) the corticonuclear, corticospinal, and rubrospinal tracts.

These signals then modulate the activity of the cerebellar cortex and nuclei, which in turn regulate descending tract neurons in the vestibulospinal, reticulospinal, and rubrospinal tracts.

In some other primates, however, experiments have shown that over time, the rubrospinal tract can assume almost all the duties of the corticospinal tract when the corticospinal tract is lesioned.

The rubrospinal tract and medullary reticulospinal tract biased flexion outweighs the medial and lateral vestibulospinal and pontine reticulospinal tract biased extension in the upper extremities.

These efferent axons cross just ventral to the anterior tegmental decussation and descend through the midbrain to the spinal cord, where the rubrospinal tract, which they make up, runs ventral to the lateral corticospinal tract in the lateral funiculus.

While decorticate posturing is still an ominous sign of severe brain damage, decerebrate posturing is usually indicative of more severe damage as the rubrospinal tract and hence, the red nucleus, is also involved indicating lesion lower in the brainstem.

The descending rubrospinal tract and reticulospinal tract originate in the red nucleus and reticular formation (which is closely associated with the central tegmental tract) respectively, thereby providing the mechanism by which this circuit exerts its effects on spinal cord motor activity.

In humans, the red nucleus also has sparse control over hands, as the rubrospinal tract is more involved in large muscle movement such as that for arms (but not the legs, as the tract terminates in the superior thoracic region of the spinal cord).