Which spinal level corresponds to plantarflexion?

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Multiple Choice

Which spinal level corresponds to plantarflexion?

Explanation:
Plantarflexion is driven primarily by the gastrocnemius-soleus complex, which is innervated by the tibial nerve from the S1-S2 nerve roots. Clinically, the Achilles reflex (ankle-jerk) is a classic test of the S1 myotome, so plantarflexion strength largely maps to S1. While S2 can contribute to plantarflexion, S1 is the level most consistently associated with this movement. L5 is more about dorsiflexion, and L4 relates to dorsiflexion and knee extension, so the best single level for plantarflexion is S1.

Plantarflexion is driven primarily by the gastrocnemius-soleus complex, which is innervated by the tibial nerve from the S1-S2 nerve roots. Clinically, the Achilles reflex (ankle-jerk) is a classic test of the S1 myotome, so plantarflexion strength largely maps to S1. While S2 can contribute to plantarflexion, S1 is the level most consistently associated with this movement. L5 is more about dorsiflexion, and L4 relates to dorsiflexion and knee extension, so the best single level for plantarflexion is S1.

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