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Biceps Brachii
O: supraglenoid tubercle, coracoid process
I: radial tuberosity
A: Flexion and supination
Brachialis
O: distal half of anterior humerus
I: coronoid process of ulna
A: flexion
Brachioradialis
O: supracondylar or lateral ridge of the humerus
I: radial styloid process
A: flexion, supination, pronation
Triceps Brachii
O: infraglenoid tubercle, posterior humerus
I: olecranon process
A: extension
Pronator Quadratus
O: distal anterior ulna
I: distal anterior radius
A: pronation
Supinator
O: lateral epicondyle of the humerus
I: Lateral radius just below the head
A: supination
