| Cortical motor areas |
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| Motor |
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| Systems |
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| 1° motor cortex |
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| Premotor
cortex |
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| Red nucleus |
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| Reticular
formation |
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| Vestibular
nuclei |
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| Superior
colliculus |
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|
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| Descending |
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| cortical
motor |
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| paths |
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| Descending |
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| brain stem |
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| paths |
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| Spinal cord: |
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| Intermediate zone |
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| Ventral horn |
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| Muscle |