Pectoral girdle & armVersion en ligne skeletal system activity par Zaynah Elliott 1 Pectoral girdle 2 Scapula 3 Clavicle 4 Humerus 5 Acromioclavicular 6 Glenohumeral 7 Sternoclavicular 8 Humeroulnar 9 Humeroradial 10 Acromion connects the arm to the trunk formed by the scapula and clavicle large, flat, triangular bone lies sideways to the back and side of the thorax slightly S-shaped bone lies at the base of the neck infront of the first rib long bone found in the arm joint with the acromial end of the clavicle found in the scapula and clavicle joint with the head of the humerus found in scapula and humerus joint with the manubrium of the sternum found in the clavicle joint with the trochlear notch of the ulna found in the humerus joint with the radial head last to be found in the humerus large projection forms the point of the shoulder that connects with the clavicle