Which muscle is primarily innervated by the lateral plantar nerve?

The primary muscle innervated by the lateral plantar nerve is indeed the abductor digiti quinti pedis. This muscle is located on the lateral side of the foot and is responsible for the abduction and flexion of the fifth toe. The lateral plantar nerve arises from the tibial nerve and specifically serves the muscles located in the foot's lateral compartment, which includes the abductor digiti quinti pedis.

Understanding the role of the lateral plantar nerve is crucial for recognizing its contributions to foot function. The abductor digiti quinti pedis plays an important role in toe stabilization and lateral balance during walking and standing, assisting in the overall function of the foot.

In contrast, the gastrocnemius is primarily innervated by the tibial nerve, as are muscles in the posterior compartment of the leg, including the posterior tibial muscle. The abductor hallucis, another intrinsic foot muscle, is specifically innervated by the medial plantar nerve, distinguishing it from other intrinsic muscles innervated by the lateral plantar nerve. This understanding of motor innervation is essential for proper assessment and treatment in contexts such as rehabilitation.