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Questions and Answers
Where do most of the fibres cross to the opposite side in the corticospinal tract?
What is the course of the fibres of the corticospinal tract?
Where do most of the fibres of the corticospinal tract arise from?
Where does the lateral corticospinal tract lie in relation to the spinal cord?
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What is the pyramidal tract also known as?
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Where do majority of the fibres of corticospinal tracts arise from?
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Where does the majority of the fibres cross to the opposite side in the corticospinal tract?
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Where does the lateral corticospinal tract lie in relation to the spinal cord?
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Which fibers descend in the anterior white column of the spinal cord?
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From where do some fibres arise that contribute to the lateral corticospinal tract?
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What is another name for corticonuclear fibres?
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Study Notes
Corticospinal Tract Overview
- Most fibres cross to the opposite side at the junction of the brainstem and spinal cord known as the pyramidal decussation.
- The corticospinal tract fibers originate mainly from the primary motor cortex, as well as the premotor and supplementary motor areas.
- Majority of the corticospinal tract fibres descend as the lateral corticospinal tract, which is located in the lateral part of the spinal cord.
- The pyramidal tract is also referred to as the corticospinal tract.
Course of Fibres
- Corticospinal fibres travel through the internal capsule, descend through the brainstem, and ultimately reach the spinal cord.
- Some fibres of the lateral corticospinal tract arise from the primary motor cortex and might also receive contributions from the parietal lobe.
- Fibres that descend in the anterior white column of the spinal cord are primarily part of the anterior corticospinal tract.
Additional Information
- Corticonuclear fibres are also known as cortico-bulbar fibres, which mainly innervate cranial nerve motor nuclei.
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Description
Test your knowledge about the anatomy and function of the corticospinal tract, also known as the pyramidal tract. Explore the origin, structure, and functions of the corticospinal tract in this quiz.
