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The heart is located in the mediastinum. It is enclosed by a double-walled sac called the pericardium. Its base points upward and its apex tips downward, facing the diaphragm.

The anterior surface of the external sheep heart has a curved anterior_interventricular_sulcus that runs across its surface and disappears under the left auricle, then reappears on the posterior side.  

The posterior surface of the sheep heart includes the posterior_interventricular_sulcus that runs vertically across its surface.

Both the anterior and posterior sulci contain coronary_vessels. The two auricles expand to accommodate blood volume for the two upper chambers of the heart, which are called the atria (sing: atrium).

Three vessels cross the base of the heart on the anterior side. From left to right they are: the pulmonary_trunk, aorta, and brachiocephalic_artery. On the posterior side of the heart, from left to right, are the pulmonary_veins and the vena_cava_veins.

Right auricle Left auricle Pulmonary trunk (which branches to become the two pulmonary arteries) Aorta Brachiocephalic artery (which branches from the anterior base of the aorta of a sheep) Anterior interventricular sulcus (with coronary vessels) Region called the apex Region called the base General location of the right atrium (which is internal) General location of the right ventricle (which is internal) General location of the left atrium (which is internal) General location of the left ventricle (which is internal) Posterior interventricular sulcus (with coronary vessels) Region called the apex Pulmonary veins Aorta Right auricle Heart Lung lobe Lung lobe Diaphragm Liver Gall bladder Diaphragm Lung lobes Lung lobes Superior vena cava Heart Pericardium -  peeled away from the surface of the heart (Right) brachiocephalic artery Diaphragm