The ULNA is a bone in the human body located in the forearm. It is the longer of the two bones in the forearm, and is also known as the 'bone in a hinge joint'. The ULNA is connected to the humerus at the elbow joint, and helps to form the elbow joint. It also connects to the radius, which is the shorter bone in the forearm. The ULNA is responsible for the movement of the forearm, and helps to stabilize the elbow joint.