At mid lumbar L3, which muscle function is expected?

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Multiple Choice

At mid lumbar L3, which muscle function is expected?

Explanation:
At mid-lumbar level L3, the function you’d expect to see most clearly is hip flexion. This is because the iliopsoas, the primary hip flexor, is innervated mainly by the L2–L3 nerve roots. So testing hip flexion aligns with the L3 myotome. In contrast, ankle plantar flexion is driven mainly by S1–S2 (gastrocnemius/soleus), elbow flexion by C5–C6 (biceps), and finger extension by C7–C8 (radial nerve). Therefore hip flexion best matches the L3 level and is the expected muscle function at this level.

At mid-lumbar level L3, the function you’d expect to see most clearly is hip flexion. This is because the iliopsoas, the primary hip flexor, is innervated mainly by the L2–L3 nerve roots. So testing hip flexion aligns with the L3 myotome.

In contrast, ankle plantar flexion is driven mainly by S1–S2 (gastrocnemius/soleus), elbow flexion by C5–C6 (biceps), and finger extension by C7–C8 (radial nerve). Therefore hip flexion best matches the L3 level and is the expected muscle function at this level.

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