Thumb anatomy, Stener's lesion, ulnar collateral ligament Trigger thumb [Thumb MRI_01] Anatomy of adductor pollicis, first CMC ligaments [Thumb MRI_02] Anatomy of thenar muscles, APL, FPL, EPB, EPL, [Thumb MRI_03] Anatomy of UCL, RCL, extensor apparatus, thumb, ulnar collateral ligament [Thumb MRI_04] Anatomy of Sesamoid bones, Volar plate, Pulley system, thumb [Thumb MRI_05] #01 UCL injury, S..