ANP 1106 Lecture 9: Anatomy Lecture 9

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

Document Summary

Pectoralis major (sternum/rib cartilages to humerus): prime mover of arm flexion; rotates arm medially; adducts arm; climbing, throwing, pushing. Latissimus dorsi (vertebrae to humerus): broad, flat back muscle; prime mover of arm extension, arm adductor, rotates arm at shoulder, rowing, swimming. Deltoid (clavicle/scapula to humerus): thick, rounded, site of im injection, prime mover of arm abduction (all fibers); also lateral & medial rotations, flexion or extensions if only some fibers used; swinging arm when walking. Trapezius (occipital & vertebrae to scapula): superficial, stabilizes, raises, retracts, rotates scapula. Rhomboids (vertebrae to scapula): deep to trapezius; aid in scapula movements (eg: squaring shoulders, rotation when lowering arm) Suprasuspinatus, impraspinatus, impres minor, subscapularous, are the rotator cuff muscles, span the shoulder joint going side to side. Muscles crossing the shoulder & elbow joints. Triceps brachii (scapula/humerus to ulna): only muscle of posterior compartment of arm; powerful forearm extensor, may help stabilize shoulder joint.