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Questions and Answers
Where do most of the fibres cross to the opposite side in the corticospinal tract?
Where do most of the fibres cross to the opposite side in the corticospinal tract?
- Corona radiata
- Cerebral peduncles
- Internal capsule
- Pyramidal decussation of the medulla (correct)
What is the course of the fibres of the corticospinal tract?
What is the course of the fibres of the corticospinal tract?
- Medullary pyramids, corona radiata, ventral part of the pons, and internal capsule
- Internal capsule, pyramids of the medulla oblongata, cerebral peduncles, and corona radiata
- Pyramidal decussation of the medulla, corona radiata, ventral part of the pons, and internal capsule
- Corona radiata, internal capsule, crus cerebri of cerebral peduncles, ventral part of the pons, and pyramids of the medulla oblongata (correct)
Where do most of the fibres of the corticospinal tract arise from?
Where do most of the fibres of the corticospinal tract arise from?
- Crus cerebri of cerebral peduncles
- Pyramidal cells of the motor area of the cerebral cortex (correct)
- Brainstem nuclei of the cranial nerves
- Corona radiata
Where does the lateral corticospinal tract lie in relation to the spinal cord?
Where does the lateral corticospinal tract lie in relation to the spinal cord?
What is the pyramidal tract also known as?
What is the pyramidal tract also known as?
Where do majority of the fibres of corticospinal tracts arise from?
Where do majority of the fibres of corticospinal tracts arise from?
Where does the majority of the fibres cross to the opposite side in the corticospinal tract?
Where does the majority of the fibres cross to the opposite side in the corticospinal tract?
Where does the lateral corticospinal tract lie in relation to the spinal cord?
Where does the lateral corticospinal tract lie in relation to the spinal cord?
Which fibers descend in the anterior white column of the spinal cord?
Which fibers descend in the anterior white column of the spinal cord?
From where do some fibres arise that contribute to the lateral corticospinal tract?
From where do some fibres arise that contribute to the lateral corticospinal tract?
What is another name for corticonuclear fibres?
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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