Upper Extremity Muscle Atlas
Michael L. Richardson, M.D. source University of Washington, Radiology Department

Abductor Digiti Minimi
Abductor Pollicis Brevis
Abductor Pollicis Longus
Adductor Pollicis
Anconeus
Biceps Brachii
Brachialis
Brachioradialis
Coracobrachialis
Deltoid
Extensor Carpi Radialis Longus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum
Extensor Pollicis Brevis
Extensor Pollicis Longus
Flexor Carpi Radialis
Flexor Carpi Ulnaris
Flexor Digitorum Profundus
Flexor Digiti Minimi Brevis
Flexor Digitorum Superficialis
Flexor Pollicis Brevis
Flexor Pollicis Longus
Infraspinatus
Latissimus Dorsi
Levator Scapulae
Opponens Pollicis
Palmaris Longus
Pectoralis Major
Pectoralis Minor
Pronator Quadratus
Pronator Teres
Rhomboid Major and Minor
Subscapularis
Supinator
Supraspinatus
Teres Major
Teres Minor
Trapezius
Triceps Brachii

Opponens Pollicis

Origin Flexor retinaculum and tubercles of scaphoid and trapezium Insertion Lateral side of 1st metacarpal Action Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially Innervation Recurrent branch of median nerve (C8 and T1) Arterial Supply Superficial palmar branch of the radial artery The medical illustrations contained in this online atlas are copyrighted © 1997 by the University of Washington.