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| Laboratory 12 : Tract Systems I |
| Somatomotor System : Corticospinal Tract |
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Corticospinal Tract
It is important to note that:
- Decussation occurs for the majority of the fibers in this tract.
- This tract projects to all spinal cord segments.
- This tract is part of the dorsolateral group, so it innervates distal musculature (i.e. distal forelimb and hindlimb).
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Slide 97 : Telencephalon
- Begins in 1º motor cortex.
- 1º motor cortex signals can be modified by premotor and supplementary (association) motor areas.
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Slide 84 :
- Axons pass from cerebral cortex through internal capsule.
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Slide 49 : Midbrain
- Axons are in cerebral peduncle.
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Slide 40 :
- Axons continue through ventral pons (corticospinal tract (CST))
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Slide 35 :
- Axons enter pyramids at the rostral medulla .
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Slide 13 : Caudal Medulla Oblongata
- Axons decussate at the caudal extent of the medulla.
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Slide 6 : C7
- Axons descend in the dorsolateral funiculus.
- Then, synapses in laminae V, VI, VII, and IX.
- Synapse on interneurons, sending commands to alpha- and gamma- motoneurons in Lamina IX.
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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
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