Which nerve innervates the tibialis posterior muscle?

The tibialis posterior muscle is primarily innervated by the tibial nerve. This nerve is a major branch of the sciatic nerve and plays a crucial role in the function of the posterior compartment of the leg, where the tibialis posterior is located. The tibialis posterior muscle is involved in actions such as plantarflexion of the foot and inversion, contributing to stability and support of the arch of the foot.

Understanding the anatomy of the leg is essential when considering nerve innervation. The tibial nerve innervates other muscles in the posterior compartment, which are responsible for similar movements and functions, reinforcing its role in supporting both mobility and stability. In the context of the question, recognizing the specific innervation by the tibial nerve emphasizes the importance of this nerve in lower limb biomechanics.