"The radial collateral ligament connects the radial styloid process with the scaphoid running in a fan-shaped, fairly longitudinal orientation forming the most radial part of the radiocarpal joint capsule. It is located deep to abductor pollicis longus and extensor pollicis brevis tendons 1-6."
"The proximal insertion or origin of the radial collateral ligament is the radial styloid process, radially and slightly dorsally located to the origin of the radioscaphocapitate ligament 1-3."