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Arm Muscles

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