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CORTICOSPINAL TRACT-INTRODUCTION

Anatomy-Spine

CORTICOSPINAL TRACT-INTRODUCTION

For the control of skeletal muscles by the spinal nerves, 2 main systems of neurons are involved.

1. DIRECT CORTCOSPINAL PATHWAY - 2 groups of neurons from the motor cortex, through the internal capsule, brainstem, to the anterior horn cells. Examples are the CORTICONUCLEAR & CORTICOSPINAL (PYRAMIDAL) pathways. AKA pyramidal pathway, upper motor neurons.

2. INDIRECT CORTICOSPINAL PATHWAY - involve a whole series of neurons on their way to the anterior horn cells. AKA extrapyramidal pathway.


The anterior horn cells and motor nuclei of the brainstem are the 'final common pathway'.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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