Which of the following bones is NOT part of the leg?

The radius is not part of the leg because it is one of the two long bones in the forearm, the other being the ulna. The radius runs parallel to the ulna and is located on the thumb side of the arm in the anatomic position. In contrast, the tibia and fibula are the two primary bones of the leg, providing structure and support. The talus is a bone in the ankle that connects the leg to the foot but is not considered a leg bone itself in the strict sense.

Thus, the correct answer being the radius highlights the distinction between bones of the leg and those of the arm, reinforcing the understanding of human anatomy, particularly the different sections of the limb.