The tibial nerve provides motor function to which part of the body?

The tibial nerve is a branch of the sciatic nerve and is primarily responsible for providing motor innervation to the muscles located in the posterior compartment of the leg and the plantar aspect of the foot. This includes key muscle groups that facilitate movements such as plantar flexion (pointing the toes) and toe flexion.

Therefore, the correct answer identifies that the tibial nerve is significantly involved in controlling the muscles that move the toes. Specifically, it innervates muscles such as the flexor digitorum longus and the flexor hallucis longus, which are essential for toe movement and support during activities like walking and running. This motor function is vital for balance and movement, as the toes play a critical role in stabilizing the body's stance and facilitating locomotion.

In contrast, other options reference areas of the body that are not innervated by the tibial nerve, such as the fingers, knees, or biceps, which are innervated by different nerves.