Which myotome combination includes plantar flexion?

• A. S1-S2
• B. L1-L2
• C. C6
• D. L5-S1

Answer: (D)

Plantar flexion is the movement used when you stand on your tiptoes, produced mainly by the calf muscles (gastrocnemius and soleus) innervated by the tibial nerve, with nerve roots in the sacral region contributing strongly to that action. Among the options, the combination that includes the sacral roots associated with these plantar‑flexor muscles is L5-S1. This pairing spans the spinal levels that contribute to the plantar-flexion motor pathways, making it the best match for including plantar flexion. The other choices either involve non-sacral levels or upper limb/myotome groups that do not produce plantar flexion.