In the course of a routine dissection, three tendon variation of musculus abductor pollicis longus (MAPL) insertion was encountered in both right and left upper extremities in a 54-year-old male cadaver. Ventral part of the muscle initiated from the dorsal part of the ulna, membrana interossea, dorsal part and lateral margin of the radius in both forearms. Muscle fibers in the most distal and lateral part clinged proximal and lateral fibers of m. abductor pollicis brevis by crossing over 1/3 distal part of the radius from posterior to anterior and towards distal. Fibers of the large muscle mass in the dorsal part of the forearm clinged to the dorsolateral side of the basis of 1. metacarpal bone as superficial and profundus fibers so that superficial and profundus fibers constituting two distinct tendons while crossing over the distal 1/3 part of the radius from posterior to anterior. MAPL variations are important in the grasping ability of the thumb and the hand, appearance and treatment of some clinical conditions and in use for transplantation in plastic surgery.