What is the primary role of the ulna?

The ulna primarily serves as one of the two long bones in the forearm, alongside the radius. Its main function is to provide structure and support to the forearm, allowing for movement and articulation at the elbow joint. The ulna is significant in forming the hinge joint of the elbow, providing stability and enabling flexion and extension of the arm.

While it does play a role in connecting to the wrist, its primary identity and functionality center around being part of the forearm structure. The ulna helps anchor muscles that facilitate movement and contribute to the forelimb's overall functionality. Thus, recognizing the ulna's essential contribution to the forearm is crucial in understanding upper extremity anatomy and movements.