ANP 1106 Lecture 10: Muscular System pt 2 (thoracic, arms and legs)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

Pectoralis major: originate sternum and rib cartilages and attach to humerus prime mover of arm flexion, rotates arm medially, adducts arm (when working with latissimus dorsi), climbing, throwing, pushing. Latissimus dorsi: from vertebrae to humerus, broad flat back muscle prime mover of arm extension, arm adductor, rotates arm at shoulder, rowing, swimming. Trapezius: from occipital and vertebrae to scapula, superficial (kite shape); upper, middle and lower portions stabilizes, raises (upper), retracts (middle horizontal fibers), rotates scapula. Rhomboids: from vertebrae to scapula, deep to trapezius; rhomboid minor smaller superior one, rhomboid major is inferior larger one aid in scapula movements (squaring shoulders, rotation when lowering arm with palm up) Rotator cuff muscles: supraspinatus, ingraspinatus, teres minor, and subscapularis (anterior side) allow lateral and medial rotation of the arm. Triceps brachii: from scapular and humerus (3 heads) to ulna, only muscle of posterior compartment of arm powerful forearm extensor, may help stabilize shoulder joint.