3. Open the chambers of the heart as shown in Figure 6.
Once again, orient yourself to the heart. Here is the aorta. Open the right atrium by making a vertical incision through the superior and inferior vena cavae. Remove the clotted blood from the atrium. Next, make an incision from the pulmonary trunk down toward the acute margin on the right side of the interventricular septum. Then continue the incision along the acute margin to expose the right ventricle. Rotate the heart to expose the left atrium. Cut between the pulmonary veins to expose this chamber. Expose the left ventricle by making an incision to the left of the anterior interventricular artery. Beginning at the coronary sulcus, incise around the apex of the heart to the left of the interventricular septum.
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