Cardiac base Formed by the left atrium and to a small extent by the right atrium Faces backward, upward and to the right
Cardiac base ◼ Formed by the left atrium and to a small extent by the right atrium. ◼ Faces backward, upward and to the right
Sternocostal surface Formed mainly by the right atrium and right ventricle and a lesser portion of its left is formed by the left auricle and ventricle Directed forwards and upwards
Sternocostal surface ◼ Formed mainly by the right atrium and right ventricle, and a lesser portion of its left is formed by the left auricle and ventricle ◼ Directed forwards and upwards
Diaphragmatic surface Formed the ventricleschiefly the left ventricle Directed backwards and downwards, and rest upon the central tendon of the diaphragm
Diaphragmatic surface ◼ Formed the ventricles－chiefly the left ventricle ◼ Directed backwards and downwards, and rest upon the central tendon of the diaphragm
Borders of the heart Right border a Vertical a Formed entirely by right atrium Left border o Round a Mainly formed by the left ventricle and partly by the left auricle Inferior border o horizontal a Formed by the right ventricle and cardiac apex
Borders of the heart ◼ Right border ❑ Vertical ❑ Formed entirely by right atrium ◼ Left border ❑ Round ❑ Mainly formed by the left ventricle and partly by the left auricle ◼ Inferior border ❑ Horizontal ❑ Formed by the right ventricle and cardiac apex
Sulcuses of the heart Coronary sulcus(circular sulcus)which marks the division between atria and ventricles contains the trunks of the coronar vessels and completely encircles the heart Interatrial sulcus separates the two atria and is hidden by pulmonary trunk and aorta in front
Sulcuses of the heart ◼ Coronary sulcus (circular sulcus) which marks the division between atria and ventricles, contains the trunks of the coronary vessels and completely encircles the heart ◼ Interatrial sulcus － separates the two atria and is hidden by pulmonary trunk and aorta in front