11/8/2012 Muscles Stabilizing Pectoral Girdle Muscles of the Upper Limb Pectoralis minor ORIGIN: INNERVATION: anterior surface of pectoral nerves ribs 3 – 5 ACTION: INSERTION: protracts / depresses scapula coracoid process (scapula) (Anterior view) Muscles Stabilizing Pectoral Girdle Muscles Stabilizing Pectoral Girdle Serratus anterior Subclavius ORIGIN: INNERVATION: ORIGIN: INNERVATION: ribs 1 - 8 long thoracic nerve rib 1 ---------------- INSERTION: ACTION: INSERTION: ACTION: medial border of scapula rotates scapula laterally inferior surface of scapula stabilizes / depresses pectoral girdle (Lateral view) (anterior view) Muscles Stabilizing Pectoral Girdle Muscles Stabilizing Pectoral Girdle Trapezius Levator scapulae ORIGIN: INNERVATION: ORIGIN: INNERVATION: occipital bone / spinous accessory nerve transverse processes of C1 – C4 dorsal scapular nerve processes of C7 – T12 ACTION: INSERTION: ACTION: INSERTION: stabilizes / elevates / retracts / upper medial border of scapula elevates / adducts scapula acromion / spine of scapula; rotates scapula lateral third of clavicle (Posterior view) (Posterior view) 1 11/8/2012 Muscles Stabilizing Pectoral Girdle Muscles Moving Arm Rhomboids Pectoralis major (major / minor) ORIGIN: INNERVATION: ORIGIN: INNERVATION: spinous processes of C7 – T5 dorsal scapular nerve sternum / clavicle / ribs 1 – 6 dorsal scapular nerve INSERTION: ACTION: INSERTION: ACTION: medial border of scapula adducts / rotates scapula intertubucular sulcus / greater tubercle flexes / medially rotates / (humerus) adducts arm (Posterior view) (Anterior view) Muscles Moving Arm Muscles Moving Arm Deltoid Latissimus dorsi ORIGIN: INNERVATION: ORIGIN: INNERVATION: acromion / spine of scapula; axillary nerve spinous processes of T7 – L5; thoracodorsal nerve lateral third of clavicle ribs 9 – 12; iliac crest of os coxae ACTION: ACTION: INSERTION: abducts arm INSERTION: extends / adducts arm deltoid tuberosity intertubercular groove (humerus) (humerus) (Anterior view) (Posterior view) Muscles Moving Arm Muscles Moving Arm Subscapularis Supraspinatus ORIGIN: INNERVATION: ORIGIN: INNERVATION: subscapular fossa subscapular nerve supraspinous fossa suprascapular nerve (scapula) (scapula) ACTION: ACTION: INSERTION: rotates arm medially INSERTION: abducts arm lesser tubercle greater tubercle (humerus) (humerus) (Posterior view) (Posterior view) 2 11/8/2012 Muscles Moving Arm Muscles Moving Arm Infraspinatus Teres minor ORIGIN: INNERVATION: ORIGIN: INNERVATION: infraspinous fossa suprascapular nerve lateral border of scapula subscapular nerve (scapula) ACTION: INSERTION: ACTION: INSERTION: rotates arm laterally greater tubercle rotates arm laterally greater tubercle (humerus) (humerus) (Posterior view) (Posterior view) Muscles Moving Arm Muscles Moving Arm Teres major Coracobrachialis ORIGIN: INNERVATION: ORIGIN: INNERVATION: inferior border of scapula subscapular nerve coracoid process musculocutaneous nerve (scapula) INSERTION: ACTION: ACTION: lesser tubercle rotates arm medially; INSERTION: flexes / adducts arm (humerus) adducts arm medial shaft of humerus (Posterior view) (Anterior view) Muscles Moving Forearm Muscles Moving Forearm Triceps brachii Anconeus ORIGIN: ORIGIN: below glenoid cavity of scapula; lateral epicondyle posterior shaft of humerus (humerus) INSERTION: INSERTION: olecranon process olecranon process (ulna) (ulna) INNERVATION: INNERVATION: radial nerve radial nerve ACTION: ACTION: extends forearm extends forearm (Posterior view) (Posterior view) 3 11/8/2012 Muscles Moving Forearm Muscles Moving Forearm Biceps brachii Brachialis ORIGIN: ORIGIN: coracoid process / body anterior face of distal humerus (scapula) INSERTION: INSERTION: coronoid process radial tuberosity (ulna) (radius) INNERVATION: INNERVATION: musculocutaneous nerve musculocutaneous nerve ACTION: ACTION: flexes forearm flexes forearm (Anterior view) (Anterior view) Muscles Moving Forearm Muscles Moving Wrist, Hand, and Fingers Brachioradialis Pronator teres ORIGIN: ORIGIN: lateral epicondyle medial epicondyle (humerus); (humerus) coronoid process (ulna) INSERTION: INSERTION: styloid process lateral shaft of radius (radius) INNERVATION: INNERVATION: median nerve radial nerve ACTION: ACTION: pronates forearm flexes forearm (Anterior / Lateral view) (Anterior view) Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Flexor carpi radialis Palmaris longus ORIGIN: ORIGIN: medial epicondyle medial epicondyle (humerus) (humerus) INSERTION: INSERTION: metacarpals 2 – 3 palmar aponeurosis INNERVATION: INNERVATION: median nerve median nerve ACTION: ACTION: flexes / abducts wrist tenses skin of palm (Anterior view) (Anterior view) 4 11/8/2012 Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Flexor carpi ulnaris Flexor digitorum superficialis ORIGIN: ORIGIN: medial epicondyle (humerus); medial epicondyle (humerus); olecranon process (ulna) coronoid process (ulna); shaft of radius INSERTION: pisiform / hamate of carpals INSERTION: middle phalanges 2 - 5 INNERVATION: ulnar nerve INNERVATION: median nerve ACTION: flexes / adducts wrist ACTION: flexes wrist / fingers (Anterior view) (Anterior view) Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Flexor digitorum profundus Flexor pollicis longus ORIGIN: ORIGIN: coronoid process / anterior surface of radius anteriolmedial surface (ulna) INSERTION: INSERTION: distal phalanx of thumb distal phalanges 2 - 5 INNERVATION: INNERVATION: median nerve ulnar / median nerves ACTION: ACTION: flexes thumb flexes wrist / fingers (Anterior view) (Anterior view) Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Pronator quadratus Extensor carpi radialis ORIGIN: ORIGIN: distal surface of anterior ulna lateral epicondyle (humerus) INSERTION: distal surface of anterior radius INSERTION: metacarpals 2 - 3 INNERVATION: median nerve INNERVATION: radial nerve ACTION: pronates forearm ACTION: extends / abducts wrist (Anterior view) (Posterior / Lateral view) 5 11/8/2012 Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Extensor digitorum Extensor carpi ulnaris ORIGIN: ORIGIN: lateral epicondyle lateral epicondyle (humerus) (humerus) INSERTION: INSERTION: distal phalanges 2 – 5 metacarpal 5 INNERVATION: INNERVATION: radial nerve radial nerve ACTION: ACTION: extends fingers extends / adducts wrist (Posterior view) (Posterior view) Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Supinator Abductor pollicis longus ORIGIN: ORIGIN: lateral epicondyle (humerus); posterior surface of radius / ulna proximal end of ulna INSERTION: INSERTION: metacarpal 1; trapezium of carpals proximal end of radius INNERVATION: INNERVATION: radial nerve radial nerve ACTION: ACTION: abducts / extends thumb suppinates forearm (Anterior / Lateral view) (Posterior view) Muscles Moving Wrist, Hand, and Fingers Muscles Moving Wrist, Hand, and Fingers Extensor pollicis Extensor indicis ORIGIN: ORIGIN: dorsal shaft of radius / ulna posterior surface of distal ulna INSERTION: INSERTION: proximal / distal ends of phalange 1 phalange 2 INNERVATION: INNERVATION: radial nerve radial nerve ACTION: ACTION: extends thumb extends index finger (Posterior view) (Posterior view) 6 .