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Forearm Muscles
Origins/Insertions/Actions
Question | Answer |
---|---|
Brachialis | O: Distal half of anterior surface of humerus I: Tuberosity and coronoid process of ulna A: Flex the elbow |
Brachioradialis | O: Proximal 2/3rds of the lateral supracondylar ridge of humerus I: Styloid process of radius A: -Flex the elbow -Assist to pronate and supinate the forearm when those movements are resisted |
Extensor Carpi Radialis Longus | O: Distal 1/3rd of the lateral supracondylar ridge of humerus I: Base of the 2nd metacarpal A: -Extend the wrist -Abduct the wrist -Assist to flex the elbow |
Extensor Carpi Radialis Brevis | O: Common extensor tendon from the lateral epicondyle of the humerus I: Base of 3rd metacarpal A: -Extend the wrist -Abduct the wrist -Assist to flex the elbow |
Extensor Carpi Ulnaris | O: Common extensor tendon from the lateral epicondyle of the humerus I: Base of 5th metacarpal A: -Extend the wrist -Adduct the wrist |
Extensor Digitorum | O: Common extensor tendon from the lateral epicondyle of the humerus I: Bases of middle and distal phalanges of 2nd-5th fingers A: -Extend the 2nd-5th fingers -Assist to extend the wrist |
Anconeus | O: Lateral epicondyle of the humerus I: Olecranon process and posterior, proximal surface of ulna A: Extend the elbow |
Extensor Indicis | O: Posterior surface of distal shaft of ulna and interosseous membrane I: Tendon of extensor digitorum at the level of 2nd metacarpal A: -Extend the 2nd finger -Adduct the 2nd finger -May assist the extend the wrist |
Flexor Carpi Radialis | O: Common flexor tendon from medial epicondyle of the humerus I: Bases of 2nd and 3rd metacarpals A: -Flex the wrist -Abduct the wrist -May assist to flex the elbow |
Palmaris Longus | O: Common flexor tendon from medial epicondyle of the humerus I: Flexor retinaculum and palmar aponeurosis A: -Tense the palmar fascia -Flex the wrist -May assist to flex the elbow |
Flexor Carpi Ulnaris | O: -Humeral Head: Common flexor tendon from medial epicondyle of humerus -Ulnar Head: Posterior surface of proximal 2/3rds of ulna I: Pisiform, hook of hamate, and base of 5th metacarpal A: -Flex the wrist -Adduct the wrist -Assist to flex the elbow |
Flexor Digitorum Superficialis | O: Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane& proximal shaft of radius I: Sides of middle phalanges of 2nd-5th fingers A: -Flex the 2nd-5th fingers -Flex the wrist |
Flexor Digitorum Profundus | O: Anterior and medial surfaces of proximal three-quarters of ulna I: Bases of distal phalanges, palmar surface of 2nd-5th fingers A: -Flex 2nd-5th fingers -Assist to flex the wrist |
Pronator Teres | O: Common flexor tendon from medial epicondyle of humerus and coronoid process of the ulna I: Middle of lateral surface of the radius A: -Pronate the forearm -Assist to flex the elbow |
Pronator Quadratus | O: Medial, anterior surface of distal ulna I: Lateral, anterior surface of distal radius A: Pronate the forearm |
Supinator | O: Lateral epicondyle of the humerus, radial collateral ligament, annular ligament, supinator crest of of the ulna I: Anterior lateral shaft of proximal 1/3rd of radial shaft A: Supinate the forearm |