Anatomy and Cell Biology 3319 Lecture Notes - Lecture 28: Latissimus Dorsi Muscle, Bicipital Groove, Musculocutaneous Nerve

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Michele Barbeau

Document Summary

Movement of the arm at the shoulder joint. Anterior muscles that move the arm: pectoralis major (top pic, origin, clavicular head = anterior surface of medial clavicle, sternocostal head = anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique. Insertion: lateral lip of intertubercular groove of humerus: action: flexion, adduction, medial rotation of shoulder. Innervation: lateral and medial pectoral nerves: coracobrachialis (bottom pic, origin: coracoid process of scapula. Insertion: middle 1/3 of medial humerus: action: flexes and adducts arm. Posterior muscles that move the arm: teres major (top pic, origin: posterior surface of inferior angle of scapula. Insertion: intertubercular groove of humerus: action: extends, adducts, and medially rotates arm, synergist w lat dorsi. Innervation: lower subscapular nerve (c6-c7: latissimus dorsi (bottom pic, origin: spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest and inferior 3-4 ribs. Insertion: intertubercular groove of humerus: action: extends, adducts and medially rotates shoulder.