The chest will not reach its full potential size unless the latissimus dorsi muscles of the upper back are fully developed. There is, in fact, a prominent interdependence between chest and back muscles. In addition, because of its attachment to the humerus, it plays a large role in movements like Chinning. Attached to the rib cage in the center and across to the shoulder, this muscle lets you perform such motions as pitching a ball underhanded, doing a wide- arm Bench Press, twisting a cap off a bottle, swimming the crawl stroke, and doing parallel bar Dips. The pectorals spread out like a fan and cover the rib cage like armor plates. The largest mass of the pectorals starts at the upper arm bone (humerus), fastened at a point under and just above where the deltoids attach to the humerus. Along the mid-body line, it attaches to the sternum (breast- bone) and the cartilage of several ribs. The upper part is attached to the clavicle (collarbone). 1.299The Chest THE MUSCLESOF THE CHESTThe pectorals consist of two parts, the clavicular (upper) portion and the sternal (lower) portion.
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