Laboratory 12 : Tract Systems I
  Somatomotor System : Corticorubrospinal Tract

Corticorubrospinal Tract

It is important to note that:

  • This tract is part of the dorsolateral group, so it innervates distal musculature (i.e. distal forelimb and hindlimb).
  • This tract decussates after it synapses with the red nucleus in the midbrain.


Slide 97 : Telencephalon

  • Begins in 1º motor cortex.
  • 1º motor cortex signals can be modified by premotor and supplementary (association) motor areas.

Slide 49 : Midbrain

  • Axons exit cerebral peduncle and synapse on neurons of red nucleus of midbrain.
  • Red nucleus axons then decussate within the midbrain.

Slide 24 : Medulla

  • Axons descend through the ventrolateral medulla.

Slide 7 : C6

  • Axons descend in the dorsolateral funiculus of spinal cord and synapses on interneurons in laminae V, VI, VII, and IX throughout spinal cord.
  • Innervates muscles of distal forelimb and hindlimb.

Copyright © 2006 - University of Pennsylvania School of Veterinary Medicine, All rights reserved.
Faculty: Dr. Richard Miselis, Dr. Peter Hand
Students: Natalie Fickel V'12, Ryan Donahue V'09, Cara Catanese V’08, Rebecca Wolf V'06, Keith Javic V'03, Ken Bixel V'99, Russel Howe-Smith V'97