Muscles of the arm: Origin, Insertion, and Action
Biceps brachii Origin: Scapula--Coracoid process and supraglenoid fossa Insertion: Tuberosity of radius Action: Flexion at shoulder and elbow; supination
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Brachialis Origin: Distal surface of humerus Insertion: Tuberosity of ulna Action: Flexion at elbow
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Brachioradialis Origin: Lateral epicondyle of humerus Insertion: Styloid process of radius Action: Flexion at elbow
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Extensor carpi radialis Origin: Lateral epicondyle of humerus (brevis) & Lateral supracondylar ridge of humerus (longus) Insertion: Base of 2nd (longus) and 3rd (brevis) metacarpal bone Action: Extension and abduction at wrist
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Extensor carpi ulnaris Origin: Lateral epicondyle of humerus Insertion: Base of 5th metacarpal Action: Extension and adduction at wrist
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Extensor digitorum Origin: Lateral epicondyle of humerus Insertion: Posterior surface of phalanges 2-5 Action: Extension at finger joints and wrist
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Flexor carpi radialis Origin: Medial epicondyle of humerus Insertion: Base of 2nd and 3rd metacarpal Action: Flexion and adduction at wrist
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Flexor carpi ulnaris Origin: Medial epicondyle of humerus Insertion: Base of 5th metacarpal bone Action: Flexion and adduction at wrist
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Flexor digitorum Origin: Medial epicondyle of humerus; surfaces of ulna and radius Insertion: Distal phalanges 2-5 Action: Flexion at finger joints and wrist
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Palmaris longus Origin: Medial epicondyle of humerus Insertion: Tendinous sheet on palm Action: Flexion at wrist
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Triceps brachii Origin: Margins of the humerus; Scapula Insertion: Olecrannon process Action: Extension at elbow
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