Origin FDP tendon Insertion Radial lateral band of the extensor expansion (tendon) Action Extends PIP and DIP joint. Innervation 1nd & 2nd lumbricals innervated by median nerve. 3rd & 4th lumbicals innervated by ulnar nerve Arterial Supply Palmar 1 - 3: Palmar metacarpal arteries
QUESTIONS 1 of 1 1 Previous Next (OBQ08.3) Which of the following unipennate muscles takes its origin on the radial side of the profundus tendon, inserts on the radial lateral band at the middle phalanx, and creates a force vector that is palmar to the joint axis of the metacarpophalangeal joint? Review Topic QID: 389 1 1st lumbrical 65% (1532/2361) 2 1st dorsal interosseous 6% (136/2361) 3 4th dorsal interosseous 3% (68/2361) 4 4th lumbrical 21% (490/2361) 5 4th palmar interosseous 5% (116/2361) ML 3 Select Answer to see Preferred Response PREFERRED RESPONSE 1