What is the primary motor function of the tibial nerve?

The primary motor function of the tibial nerve is indeed plantarflexion of the ankle and toes. The tibial nerve is a branch of the sciatic nerve and it innervates the muscles in the posterior compartment of the leg, which are primarily responsible for facilitating the action of plantarflexion. This includes key muscles such as the gastrocnemius, soleus, and plantaris, enabling movements like standing on tiptoes or pushing off during walking.

Understanding the role of the tibial nerve in this context is crucial, as it emphasizes its significance in lower limb function and mobility. The action of plantarflexion is vital in gait mechanics, allowing individuals to propel themselves forward while walking or running. Consequently, any dysfunction of the tibial nerve can lead to a profound impact on the ability to perform these essential actions.

Other choices mentioned do not align with the primary motor function of the tibial nerve. For instance, while knee extension is primarily controlled by the quadriceps muscle, innervated by the femoral nerve, hip flexion is associated with muscles like the iliopsoas, and adduction of the thigh is managed by the adductor muscles innervated by the obturator nerve. Therefore, the focus on plantarflex