Corticospinal tract

Corticospinal tract is a part of the nervous system that plays a key role in carrying messages from the brain to the spinal cord. It is one of the most important motor pathways, and it is responsible for voluntary movement.

Anatomy

The corticospinal tract originates in the cerebral cortex, specifically in the precentral gyrus. It travels down through the brainstem, where it forms a structure known as the pyramids of the medulla. At this point, about 90% of the fibers cross over to the opposite side in a process known as decussation. The tract then continues down into the spinal cord.

Function

The corticospinal tract is primarily responsible for voluntary motor control of the body and limbs. This includes both fine, precise movements, such as those needed for writing, and larger movements, such as those used in walking.

Clinical significance

Damage to the corticospinal tract can result in a number of neurological conditions, including spastic paralysis, muscle weakness, and Babinski sign. The location and extent of the damage will determine the specific symptoms and their severity.

See also

• Motor neuron
• Upper motor neuron
• Lower motor neuron
• Pyramidal tract

References

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