Anatomy 338 Unit 4: The Upper Extremity

• trapezius actions

  superior fibers: elevate and superiorly rotate scapula

  middle fibers: retract scapula

  inferior fibers: depress scapula
• trapezius innervation

  accessory nerve
• levator scapulae actions

  elevates and inferiorly rotates scapula
• levator scapulae insertion

  superior medial border of scapula
• levator scapulae innervation

  dorsal scapular nerve
• rhomboid major actions

  elevates, retracts, and inferiorly rotates scapula
• rhomboid major insertion

  medial border of scapula
• rhomboid major innervation

  dorsal scapular nerve
• rhomboid minor actions

  elevates, retracts, and inferiorly rotates scapula
• rhomboid minor insertion

  superior medial border of scapula
• rhomboid minor innervation

  dorsal scapular nerve
• pectoralis minor actions

  protract and depress scapula
• pectoralis minor insertion

  coracoid process of scapula
• pectoralis minor innervation

  medial pectoral nerve
• serratus anterior actions

  protract and superior rotate scapula, stabilizes scapula
• serratus anterior insertion

  anterior medial border of scapula
• serratus anterior innervation

  long thoracic nerve
• subclavius actions

  stabilize and depress clavicle
• subsclavius innervation

  nerve to subclavius
• latissimus dorsi actions

  extend, adduct, and medially rotate GH joint
• latissimus dorsi insertion

  intertubercular groove of humerus
• latissimus dorsi innervation

  thoracodorsal nerve
• pectoralis major actions

  flex arm, adduct and medially rotate GH joint
• pectoralis major insertion

  intertubercular groove of humerus
• pectoralis major innervation

  lateral and medial pectoral nerves
• deltoid actions

  anterior fibers: flex and medially rotate GH joint

  middle fibers: abduct GH joint

  posterior fibers: extend and laterally rotate GH joint
• deltoid insertion

  deltoid tuberosity of humerus
• deltoid innervation

  axillary nerve
• coracobrachialis actions

  adduct and flex GH joint
• coracobrachialis origin

  coracoid process
• coracobrachialis insertion

  middle medial shaft of humerus
• coracobrachialis innervation

  musculocutaneous nerve
• teres major actions

  extend, adduct, and medially rotate GH joint
• teres major origin

  inferior lateral border and inferior angle of scapula
• teres major insertion

  lesser tubercle and intertubercular groove of humerus
• teres major innervation

  lower subscapular nerve
• triceps brachii actions

  extend GH joint, extend elbow
• triceps brachii origin

  infraglenoid tubercle
• triceps brachii insertion

  olecranon process
• triceps brachii innervation

  radial nerve