Which bone is located in the forearm?

The ulna is one of two long bones in the forearm, the other being the radius. It runs parallel to the radius and extends from the elbow to the wrist on the inner side of the forearm. The ulna plays a crucial role in forming the elbow joint and is involved in movements and stability of the arm.

In contrast, the tibia is located in the lower leg, connecting the knee and the ankle. The humerus is the bone of the upper arm, situated between the shoulder and the elbow. The scapula, commonly known as the shoulder blade, is part of the shoulder girdle and is not found in the forearm. Thus, the ulna is the correct answer, as it specifically pertains to the forearm's anatomy.