Rubrospinal tract

The rubrospinal tract is a part of the nervous system. It is a part of the lateral indirect extra-pyramidal tract.

Rubrospinal tract
Rubrospinal tract is labeled in red on the left of the diagram.
Schematic representation of the chief ganglionic categories (Rubrospinal tract not labeled, but red nucleus visible near center)
Details
Identifiers
Latintractus rubrospinalis
NeuroLex IDbirnlex_1476
TA98A14.1.02.220
A14.1.04.136
A14.1.05.332
A14.1.06.213
TA26097
FMA73995
Anatomical terminology

Structure

In the midbrain, it originates in the magnocellular red nucleus, crosses to the other side of the midbrain, and descends in the lateral part of the brainstem tegmentum. In the spinal cord, it travels through the lateral funiculus of the spinal cord, coursing adjacent to the lateral corticospinal tract.[1]

Function

In humans, the rubrospinal tract is one of several major motor control pathways. It is smaller and has fewer axons than the corticospinal tract, suggesting that it is less important in motor control. It is one of the pathways for the mediation of involuntary movement, along with other extra-pyramidal tracts including the vestibulospinal, tectospinal, and reticulospinal tracts. The tract is responsible for large muscle movement regulation flexor and inhibiting extensor tone as well as fine motor control.[2] It terminates primarily in the cervical and thoracic portions of the spinal cord, suggesting that it functions in upper limb but not in lower limb control.

It is small and rudimentary in humans. 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.

See also

References
  1. Patestas, Maria Antoniou & Gartner, Leslie P. (2006). A textbook of neuroanatomy. Wiley-Blackwell. p. 11. ISBN 978-1-4051-0340-4.
  2. "Spinal Reflexes and Descending Motor Pathways (Section 3, Chapter 2) Neuroscience Online: An Electronic Textbook for the Neurosciences | Department of Neurobiology and Anatomy - the University of Texas Medical School at Houston". Archived from the original on 2011-12-27. Retrieved 2012-01-03.
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