SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY
Shoulder muscles. Computer artwork of an oblique posterior view of two of the muscles (red) of the shoulders and their attachments to the bones of the chest, back and upper arms. The deltoid muscle wraps around the shoulder, running from the clavicle (collar bone) and the acromion of the scapula (shoulder blade) to the deltoid tuberosity on the humerus (upper arm bone). The acromion is the ridge along the top of the scapula. The large pectoralis major muscle (not clearly shown) runs from the clavicle and sternum (breastbone) to the humerus. The deltoid muscle works with other muscles to enable a wide range of arm movements.
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