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Anterior view of the heart, dissected, after long boiling to show the superficial muscular fibers. The aorta (b') and pulmonary artery (a') have been cut short close to the semilunar valves. Labels: a, right ventricle; b, left ventricle; c, c, groove between ventricles; d, d', right auricle (atrium); e, e', left auricle (atrium); f, superior vena cava; g', g", right and left pulmonary veins. The fibers are seen running a circular, oblique, transverse, and longitudinal direction.

Anterior View of the Heart

Anterior view of the heart, dissected, after long boiling to show the superficial muscular fibers. The…