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Triceps brachii
Origins: infraglenoid tubercle of scapula; medial and posterior humerus
Insertion: olecranon of ulna
Action: elbow extension
Biceps brachii
Origins: coracoid process and supraglenoid tubercle of the scapula
Insertion: radial tuberosity
Actions: elbow flexion; forearm supination
Brachialis
Origin: distal anterior humerus
Insertion: coronoid process of ulna
Action: elbow flexion
Brachioradialis
Origin: lateral distal humerus
Insertion: styloid process of radius
Flexor carpi radialis
Origin: medial epicondyle of humerus
Insertions: base of metacarpals 2 and 3
Actions: flexes wrist; abducts hand
Flexor carpi ulnaris
Origins: medial epicondyle of humerus; olecranon process of ulna
Insertions: base of metacarpal 5; pisiform and hamate bones
Actions: flexes wrist; adducts hand
Extensor carpi radialis longus
Origin: lateral supracondylar ridge of humerus
Insertion: base of metacarpal 2
Actions: extends and abducts wrist
Extensor carpi ulnaris
Origins: lateral epicondyle of humerus; posterior ulna
Insertion: base of metacarpal 5
Actions: extends and adducts wrist
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