Which nerve innervates the anconeus muscle?

The anconeus muscle is primarily responsible for assisting in the extension of the forearm at the elbow joint. This muscle is located at the posterior aspect of the elbow and plays a role in stabilizing the elbow during various movements. The innervation of the anconeus muscle comes from the radial nerve, which is responsible for supplying motor signals to this muscle.

The radial nerve typically innervates muscles in the posterior compartment of the arm and forearm, including the triceps brachii and the anconeus, providing the necessary motor function for these muscles to perform their actions effectively. The close association of the radial nerve with the anconeus emphasizes its role in extending the elbow.

In summary, the radial nerve is the correct answer as it specifically innervates the anconeus muscle, enabling it to fulfill its function in elbow extension and stabilization.