Which myotome includes plantar flexion and eversion?

• A. L5-S1
• B. S1-S2
• C. L3
• D. C7

Answer: (B)

Plantar flexion and eversion are movements controlled by the lower spinal segments, and the myotome that best fits both actions is S1–S2. Plantar flexion (standing on tiptoes) is produced mainly by the gastrocnemius-soleus complex, which receives its motor input from S1–S2 nerve roots. Eversion (turning the sole outward) involves the peroneal muscles, which are also predominantly innervated by the same lower roots. Because both actions map most consistently to S1–S2, that myotome best matches the combination. The other options point to different regions or upper-limb actions and don’t align with these ankle movements.