<P> The bones of the thorax, called the "thoracic skeleton" is a component of the axial skeleton . </P> <P> It consists of the ribs and sternum. The ribs of the thorax are numbered in ascending order from 1 - 12 . 11 & 12 are known as floating ribs because they have no anterior attachment point in particular the cartilage attached to the sternum, as 1 - 7 are, and therefore are termed "floating". Whereas ribs 8 - 10 are termed false ribs as their costal cartilage articulates with the costal cartilage of the rib above . </P> <P> The anatomy of the chest can also be described through the use of anatomical landmarks . The nipple in the male is situated in front of the fourth rib or a little below; vertically it lies a little external to a line drawn down from the middle of the clavicle; in the female it is not so constant . A little below it the lower limit of the great pectoral muscle is seen running upward and outward to the axilla; in the female this is obscured by the breast, which extends from the second to the sixth rib vertically and from the edge of the sternum to the mid-axillary line laterally . The female nipple is surrounded for half an inch by a more or less pigmented disc, the areola . The apex of a normal heart is in the fifth left intercostal space, three and a half inches from the mid-line . </P> <P> Different types of diseases or conditions that affect the chest include pleurisy, flail chest, atelectasis, and the most common condition, chest pain . These conditions can be hereditary or caused by birth defects or trauma . Any condition that lowers the ability to either breathe deeply or to cough is considered a chest disease or condition . </P>

Where is the heart located in the rib cage
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