The Corticospinal Tract (CST) is the primary descending motor pathway that carries voluntary movement commands from the cerebral cortex to the spinal cord. This tract is essential for fine motor control, dexterity, and skilled movements[1].
In neurodegenerative diseases, the corticospinal tract undergoes significant degeneration, contributing to the characteristic motor symptoms including weakness, spasticity, and loss of voluntary movement[2].
| Property | Value |
|---|---|
| Category | Motor Pathway |
| Location | Motor cortex, internal capsule, cerebral peduncle, pyramids, lateral funiculus |
| Cell Types | Upper motor neurons (Betz cells, pyramidal neurons) |
| Primary Neurotransmitter | Glutamate |
| Key Markers | VGLUT1, CTIP2, FoxP1, SatB2 |
The corticospinal tract originates from multiple cortical areas:
Approximately 1 million corticospinal neurons project from each cerebral hemisphere.
The tract descends through:
Fibers terminate on:
The corticospinal tract is essential for:
Corticospinal fibers modulate:
The corticobulbar tract is a component controlling:
ALS is characterized by:
Degeneration of corticospinal tract causes:
A rare disorder affecting only upper motor neurons:
Upper motor neuron lesions cause:
The study of Corticospinal Tract Fibers has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Lemon RN., Corticospinal neurons and motor cortex function (2008). 2008. ↩︎
Kuang R., Corticospinal tract degeneration in ALS (2015). 2015. ↩︎
Nieuwenhuys R., The human central nervous system (2013). 2013. ↩︎
Duvernoy HM., The human brain: Surface, blood supply (1999). 1999. ↩︎
Pierrot-Deseilligny E., Control of gait and posture (2004). 2004. ↩︎
[Hardiman O., Amyotrophic lateral sclerosis (2017)](https://doi.org/10.1016/S0140-6736(16). 2017. ↩︎
Gracies JM., Physical modalities for spasticity (2005). 2005. ↩︎