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

Pectoralis Major

Origin Clavicular head: anterior surface of medial half of clavicle Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle Insertion Lateral lip of intertubercular groove of humerus Action Adducts and medially rotates humerus; draws scapul anteriorly and inferiorly Acting alone: clavicular head flexes humerus and sternocostal head extends it Innervation Lateral and medial pectoral nerves; clavicular head (C5 and C6, sternocostal head (C7, C8, and T1) Arterial Supply pectoral branch of the thoracoacromial trunk The medical illustrations contained in this online atlas are copyrighted © 1997 by the University of Washington.