The ulna is one of the two bones in the forearm, alongside the radius. The ulna runs parallel to the radius on the inner side of the forearm and is slightly longer. It plays a vital role in forearm rotation and stability. The ulna forms the bony prominence of the elbow and serves as an attachment point for muscles involved in forearm movement and wrist control. It works in conjunction with the radius to allow for various movements of the forearm, such as flexion and extension. The ulna's structure and articulations contribute to the overall functionality and strength of the forearm and upper limb.

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