Lumbar Plexus V2 Practice Test

Which nerve innervates the 1st lumbrical muscle? (Alternate phrasing)

Tibial nerve Medial plantar nerve Lateral plantar nerve Common fibular nerve

Correct Answer:

Medial plantar nerve

Explanation:

In the sole of the foot, the first lumbrical is supplied by the medial plantar nerve, a branch of the tibial nerve. This nerve specifically innervates several sole muscles, including abductor hallucis, flexor digitorum brevis, flexor hallucis brevis, and the first lumbrical. The other lumbricals (second through fourth) are innervated by the lateral plantar nerve. The tibial nerve is the parent nerve, but the precise motor supply for this muscle is the medial plantar nerve, while the common fibular nerve does not innervate intrinsic plantar muscles.

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