Unit 4: Upper Extremity Muscles (Forearm) Flashcards
Action:
-Extend the elbow
Origin:
-Lateral epicondyle of the humerus
Insertion:
-Olecranon process and posterior, proximal surface of ulna
anconeus
Action:
-Flex the elbow
Origin:
-Distal half of anterior surface of humerus
Insertion:
-Tuberosity and coronoid process of ulna
brachialis
Action:
-Flex the elbow
Origin:
-Proximal two-thirds of the lateral supracondylar ridge of humerus
Insertion:
-Styloid process of radius
brachioradialis
Action:
-Pronate the forearm
Origin:
-Medial, anterior surface of distal ulna
Insertion:
-Lateral, anterior surface of distal radius
pronator quadratus
Action:
-Pronate the forearm
Origin:
-Common flexor tendon from medial epicondyle of humerus and coronoid process of the ulna
Insertion:
-Middle of lateral surface of the radius
pronator teres
Action:
-Supinate the forearm
Origin:
-Lateral epicondyle of humerus, radial collateral ligament, annular ligament, and supinator crest of the ulna
Insertion:
-Anterior, lateral surface of proximal one-third of radial shaft
supinator
Action:
-Abduct the thumb
-Extend the thumb
-Abduct the thumb
Origin:
-Posterior surface of radius and ulna, and interosseous membrane
Insertion:
-Base of first metacarpal
abductor pollicis longus
Action:
-Extend the wrist
-Abduct the wrist
Origin:
-Common extensor tendon from the lateral epicondyle of humerus
Insertion:
-Base of third metacarpal
extensor carpi radialis brevis
Action:
-Extend the wrist
-Abduct the wrist
Origin:
-Distal one-third of the lateral supracondylar ridge of humerus
Insertion:
-Base of second metacarpal
extensor carpi radialis longus
Action:
-Extend the wrist
-Adduct the wrist
Origin:
-Common extensor tendon from the lateral epicondyle of humerus
Insertion:
-Base of fifth metacarpal
extensor carpi ulnaris
Action:
-Extend the second through fifth fingers
Origin:
-Common extensor tendon from the lateral epicondyle of humerus
Insertion:
-Bases of middle and distal phalanges of second through fifth fingers
extensor digitorum
Action:
-Extend the second finger
-Adduct the second finger
Origin:
-Posterior surface of distal shaft of ulna and interosseous membrane
Insertion:
-Tendon of the extensor digitorum at the level of the second metacarpal
extensor indicis
Action:
-Extend the thumb
-Abduct the wrist
Origin:
-Posterior surface of radius and interosseous membrane
Insertion:
-Base of proximal phalanx of thumb
extensor pollicis brevis
Action:
-Extend the thumb
-Abduct the wrist
Origin:
-Posterior surface of ulna and interosseous membrane
Insertion:
-Base of distal phalanx of thumb
extensor pollicis longus
Action:
-Flex the wrist
-Abduct the wrist
Origin:
-Common flexor tendon from medial epicondyle of humerus
Insertion:
-Bases of second and third metacarpals
flexor carpi radialis
Action:
-Flex the wrist
-Adduct the wrist
Origin:
-Humeral head, common flexor tendon from medial epicondyle of humerus
-Ulnar head, posterior surface of proximal two-thirds of ulna
Insertion:
-Pisiform, hook of the hamate and base of fifth metacarpal
flexor carpi ulnaris
Action:
-Flex the second through fifth fingers
Origin:
-Anterior and medial surfaces of proximal three-quarters of ulna
Insertion:
-Bases of distal phalanges, palmar surface of second through fifth fingers
flexor digitorum profundus
Action:
-Flex the second through fifth fingers
-Flex the wrist
Origin:
-Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius
Insertion:
-Sides of middle phalanges of second through fifth fingers
flexor digitorum superficialis
Action:
-Flex the thumb
Origin:
-Anterior surface of radius and interosseous membrane
Insertion:
-Base of distal phalanx of thumb
flexor pollicis longus
Action:
-tense the palmar fascia
-Flex the wrist
Origin:
-Common flexor tendon from medial epicondyle of humerus
Insertion:
-Flexor retinaculum and palmar aponeurosis
palmaris longus
