The ULNA is the lower arm bone, also known as the cubitus. It is one of the two bones in the forearm, the other being the radius. The ULNA is located on the medial side of the forearm and is the longer of the two bones. It is connected to the humerus at the elbow joint and to the wrist bones at the wrist joint. It is an important part of the skeletal system, providing stability and support for the arm.