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Arm Muscles

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Muscle
Origin
Insertion
Action
Pectoralis Minor   ~2-5 ribs   coracoid process of scapula   adbucts scapula and rotates it downward  
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Serratus anterior   superior 8-9 ribs   vertebral border and angle of scapula   adbucts scapula and rotates it upward  
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Trapezius   occipital bone, spine of C7 and T1-T12   clavicle, acromion, spine of scapula   elevate, adduct, depress scapula, rotates it upward  
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Pectoralis Major   clavicle, sternum, ~1-7 ribs   intertubercular sulcus of humerus   adducts and medially rotates arm  
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Latissimus Dorsi   spines of T6-T12, L1-L5, crests of sacrum and ilium   intertubersular sulcus of humerus   extends, adducts, and medially rotates arm and shoulder (swimming movement)  
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Deltoid   clavicle, acromion, spine of scapula   deltoid tuberosity of humerus   adbuct, flex, extand, medially and lateral rotate arm  
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Coracobrachialis   coracoid process of scapula   medial shaft of humerus   flex and adduct arm  
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Biceps Brachii   long head: supraglenoid tubercle short head: coracoid process of scapula   radial tuberosity of radius   flex arm and forearm, supinates forearm  
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Brachialis   distal anterior shaft of humerus   coronoid process of ulna   flex forearm  
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Brachioradialis   distal lateral shaft of humerus   styloid process of raduis   flexes, supinates and pronates forearm  
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Triceps Brachii   Humerus and scapula   olecranon of ulna   extends forearm and arm  
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Flexor Carpi Radialis   medial epicondyle of humerus   2nd and 3rd metacarpals   flex, abduct hand at wrist  
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Palmaris Longus   medial epicondyle of humerus   flexor retinaculum and palmar aponeurosis   weak wrist flexor  
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Flexor Carpi Ulnaris   Medial epicondyle of humerus   pisiform, hamate, and 5th metacarpal   flex, adduct hand at wrist  
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Extensor Carpi Radialis   lateral suprecondylar ridge of humerus   2nd matecarpal   extend, abduct hand at wrist  
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Extensor Carpi Radialis   lateral epicondyle of humerus   3rd metacarpal   extend, abduct hand at wrist  
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Extensor Digiti Minimi   lateral epicondyle of humerus   5th phalanx   extands proximal plalanx of little finger  
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Extensor Pollicis Brevis   posterior raduis   proximal phalanx of thumb   extends proximal phalanx of thumb  
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Abductor Pollicis Longus   posteros radius and ulna   1st metacarpal   abducts and extends thumb and abducts wrist  
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Extensor Pollicis Longus   posterior shaft of radius   distal phalanx of thumb   extends distal phanlanx of thumb and abducts wrist  
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Extensor Indicis   posterior ulna   tendon of extensor digitorum of index   extends phalanges of index and wrist  
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