A technique for preparing a cast in synthetic resin of the cavities and blood vessels of the heart.

This technique provides a method for demonstrating the principal branches of the coronary arteries, and the larger cardiac veins. At the same time a cast of the cavities of the heart is produced. Although a relatively low injection pressure is used, the thin-walled cavities of the atria and the right ventricle are considerably distended, so that the cast of these cavities is larger than the cavities were themselves in life. But, in spite of this defect, the cast of the cavities serves the useful purpose of making it easy to visualize the form of the heart which contained them, and in this way increases the value of the cast of the vessels.