What is a key characteristic of the annular ligament?

The annular ligament is primarily characterized by its composition of fibrous tissue. This type of tissue is strong and flexible, which is crucial for the ligament’s role in providing stability and support to the joint it encircles, specifically the radial head at the elbow. The fibrous nature allows the annular ligament to form a ring that secures the radial head in place while permitting the necessary range of motion during forearm pronation and supination.

While the other options may seem relevant to different ligaments or structures, they do not accurately describe the annular ligament. It does not connect carpal bones, nor does it surround the head of the ulna specifically; rather, it encircles the radius at the elbow. Additionally, while ligaments contribute to overall joint stability, the annular ligament does not directly allow for flexion of the wrist, which is primarily achieved by tendons and other ligaments in the wrist joint complex.