What is the ulna known for in the context of human anatomy?

The ulna is known in human anatomy as the larger and longer bone of the forearm. It is located on the inner side of the forearm when the palm is facing forward, while the radius is positioned on the outer side. This anatomical relationship is important for understanding the structures and movement capabilities of the forearm, as the ulna provides stability to the wrist and acts as a point of attachment for various muscles that facilitate forearm and wrist movement.

The ulna plays a crucial role in forming the elbow joint at its proximal end, where it articulates with the humerus, and contributes to the wrist joint at its distal end, though it does not directly make contact with the wrist bones. Its length and size contribute to its function in providing leverage for movement, as well as its role in weight-bearing activities when pushing or pulling.

In contrast, the radius is shorter and allows for a greater range of motion around the ulna, especially in rotation. Understanding the relative sizes and positions of these bones is fundamental in the study of human anatomy and highlights the specific functions of each bone in the forearm.