Abductor Pollicis Longus

Supraspinous Fascia
... space, triangular interval) Forearm anterior superficial pronator teres · palmaris longus · flexor carpi radialis · flexor carpi ulnaris · flexor digitorum ...

Thumb - Human Anatomy - Muscles - Extrinsic
... A ventral forearm muscle, the flexor pollicis longus (FPL) originates on the anterior side of the radius distal to the radial tuberosity and from the interosseous membrane ... tendon sheath, after which it lies between the heads of the flexor pollicis brevis ... by the anterior interosseus branch of the median nerve (C7-C8) The abductor pollicis longus (APL) originates on the dorsal sides of both the ulna and the radius, and from the interosseous ...