T A B L E 9 . 6 Muscles of the Anterior Fascial Compartment of the Forearm Muscle Origin Insertion Nerve Supply Nerve Rootsa Action Pronator Teres Humeral head Medial epicondyle of humerus Lateral aspect of shaft of radius Median nerve C6, 7 Pronation and flexion of forearm Ulnar head Medial border of coronoid process of ulna Flexor carpi radialis Medial epicondyle of humerus Bases of second and third metacarpal bones Median nerve C6, 7 Flexes and abducts hand at wrist joint Palmaris longus Medial epicondyle of humerus Flexor retinaculum and palmar aponeurosis Median nerve C7, 8 Flexes hand Flexor Carpi Ulnaris Humeral head Medial epicondyle of humerus Pisiform bone, hook of the hamate, base at fifth metacarpal bone Ulnar nerve C8; T1 Flexes and adducts hand at wrist joint Ulnar head Medial aspect of olecranon process and posterior border of ulna Flexor Digitorum Superficialis Humeroulnar head Medial epicondyle of humerus; medial border of coronoid process of ulna Middle phalanx of medial four fingers Median nerve C7, 8; T1 Flexes middle phalanx of fingers and assists in flexing proximal phalanx and hand Radial head Oblique line on anterior surface of shaft of radius Flexor pollicis longus Anterior surface of shaft of radius Distal phalanx of thumb Anterior interosseous branch of median nerve C8; T1 Flexes distal phalanx of thumb Flexor digitorum profundus Anteromedial surface of shaft of ulna Distal phalanges of medial four fingers Ulnar (medial half) and median (lateral half) nerves C8; T1 Flexes distal phalanx of fingers; then assists in flexion of middle and proximal phalanges and wrist Pronator quadratus Anterior surface of shaft of ulna Anterior surface of shaft of radius Anterior interosseous branch of median nerve C8; T1 Pronates forearm
