1122 Chapter cardiac system anatomy: heart surfaces and borders( HUMAN HEART ANATOMY , SURFACES AND BORDERS

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The heart is a hollow muscular pump, which lies in the middle mediastinum. On its surface, it has several distinctive features which are of anatomical and clinical importance. The heart has been described by many texts as a pyramid which has fallen over . The apex of this pyramid pointing in an anterior-inferior direction. In its typical anatomical orientation, the heart has 5 surfaces: anterior (or sternocostal) right ventricle, posterior (or base) left atrium. Inferior (or diaphragmatic) left and right ventricles: right pulmonary right atrium, left pulmonary left ventricle. Separating the surfaces of the heart are its borders. There are four main borders of the heart: Inferior border left ventricle and right ventricle: right border right atrium, left border left ventricle (and some of the left atrium, superior border right and left atrium and the great vessels. On the interior, it is divided into four chambers.