Which myotome maps to elbow extension and wrist flexion?

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Multiple Choice

Which myotome maps to elbow extension and wrist flexion?

Explanation:
The key idea is how motor function maps to spinal nerve roots (myotomes). For elbow extension and wrist flexion, the strongest shared nerve root is C7. Elbow extension uses the triceps, which is innervated by the radial nerve with a major contribution from C7. Wrist flexion involves the wrist flexor muscles, which receive input that is dominantly C7 along with other roots, making C7 the common myotome for both movements. Other roots don’t cover both actions as effectively: C6 is more tied to wrist extension and elbow flexion somewhat, while C5 and L3 map to other regions (shoulder and knee, respectively). So C7 best explains both elbow extension and wrist flexion.

The key idea is how motor function maps to spinal nerve roots (myotomes). For elbow extension and wrist flexion, the strongest shared nerve root is C7. Elbow extension uses the triceps, which is innervated by the radial nerve with a major contribution from C7. Wrist flexion involves the wrist flexor muscles, which receive input that is dominantly C7 along with other roots, making C7 the common myotome for both movements. Other roots don’t cover both actions as effectively: C6 is more tied to wrist extension and elbow flexion somewhat, while C5 and L3 map to other regions (shoulder and knee, respectively). So C7 best explains both elbow extension and wrist flexion.

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