Radial collateral ligament

1-Each collateral ligament is formed from three parts.

2-Each collateral ligament arises from corresponding epicondyle.

3-Radial collateral ligament is formed from three ligaments, the first one arises from lateral epicondyle and inserts in radius and known as radial collateral proper, and the second one arises also from lateral epicondyle and inserted in ulna known as lateral ulnar collateral ligament.

Normal MRI anatomy. A, Normal coronal anatomy. Coronal gradient-recalled-echo MR image illustrating the ulnar collateral ligament (UCL), radial collateral ligament (RCL), common flexor tendon (CFT), and common extensor tendon (CET).