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