Which nerve innervates the flexor hallucis brevis?

Which nerve innervates the flexor hallucis brevis?

• A. Medial Plantar Nerve
• B. Deep Fibular Nerve
• C. Lateral Plantar Nerve
• D. Tibial Nerve

Answer: (A)

The muscle that flexes the big toe at the metatarsophalangeal joint is innervated by the medial plantar nerve. This nerve is a branch of the tibial nerve and supplies the medial sole muscles, including abductor hallucis, flexor digitorum brevis, flexor hallucis brevis, and the first lumbrical. The deep fibular nerve serves dorsum foot muscles, not these plantar intrinsic muscles. The lateral plantar nerve handles many of the other plantar muscles, but flexor hallucis brevis specifically receives input from the medial plantar nerve. While the tibial nerve is the parent nerve that gives rise to the plantar nerves, the direct motor supply to this muscle is via the medial plantar nerve.

The muscle that flexes the big toe at the metatarsophalangeal joint is innervated by the medial plantar nerve. This nerve is a branch of the tibial nerve and supplies the medial sole muscles, including abductor hallucis, flexor digitorum brevis, flexor hallucis brevis, and the first lumbrical. The deep fibular nerve serves dorsum foot muscles, not these plantar intrinsic muscles. The lateral plantar nerve handles many of the other plantar muscles, but flexor hallucis brevis specifically receives input from the medial plantar nerve. While the tibial nerve is the parent nerve that gives rise to the plantar nerves, the direct motor supply to this muscle is via the medial plantar nerve.