Flexor pollicis longus Middle half of radius, interosseous Distal phalanx of thumb Flexes thumb and wrist Median membrane, coronoid process of ulna Palmaris longus Medial epicondyle of the humerus Palmar aponeurosis Weak flexion of Median MUSCLES OF ORIGIN INSERTION ACTION NERVE POSTEROLATERAL FOREARM Brachioradialis Lateral supracondylar ridge Styloid process of radius Flexes forearm Radial Extensor radialis Lateral supracondylar ridge of Second metacarpal Extends and abducts wrist Radial longus humerus Extensor carpi radialis Lateral epicondyle of humerus Third metacarpal Extends and abducts wrist Radial brevis Extensor digitorum Lateral epicondyle of humerus Distal and middle phalanges of each Extends fingers and hand Radial finger Extensor digiti minimi Lateral epicondyle of humerus Tendon of extensor digitorum on Extends 5th and hand Radial fifth phalanx Extensor carpi ulnaris Lateral epicondyle of humerus and metacarpal Extends and adducts hand at wrist joint Radial posterior border of ulna Abductor pollicis longus Posterior surface of ulna and radius, First metacarpal Abducts and extends thumb Radial and interosseous membrane Extensor pollicis brevis Posterior surface of middle of radius Base of proximal phalanx of thumb Extends thumb Radial and interosseous membrane
Flexor pollicis longus Middle half of radius, interosseous membrane, coronoid process of ulna Distal phalanx of thumb Flexes thumb and wrist Median Palmaris longus Medial epicondyle of the humerus Palmar aponeurosis Weak flexion of Median MUSCLES OF POSTEROLATERAL FOREARM ORIGIN INSERTION ACTION NERVE Brachioradialis Lateral supracondylar ridge Styloid process of radius Flexes forearm Radial Extensor radialis longus Lateral supracondylar ridge of humerus Second metacarpal Extends and abducts wrist Radial Extensor carpi radialis brevis Lateral epicondyle of humerus Third metacarpal Extends and abducts wrist Radial Extensor digitorum Lateral epicondyle of humerus Distal and middle phalanges of each finger Extends fingers and hand Radial Extensor digiti minimi Lateral epicondyle of humerus Tendon of extensor digitorum on fifth phalanx Extends 5th and hand Radial Extensor carpi ulnaris Lateral epicondyle of humerus and posterior border of ulna metacarpal Extends and adducts hand at wrist joint Radial Abductor pollicis longus Posterior surface of ulna and radius, and interosseous membrane First metacarpal Abducts and extends thumb Radial Extensor pollicis brevis Posterior surface of middle of radius and interosseous membrane Base of proximal phalanx of thumb Extends thumb Radial
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