Figure 7. Ventricularization of the myocardial outflow tract of the corn snake.

A. At 2 days the myocardial outflow tract (mot) constitutes most of the inner curvature of the heart (broken line) and the luminal length is 1180 µm. B. The myocardial outflow tract shortens to 470 µm by 12 days. C. By 42 days the myocardial outflow tract is shorter still (200 µm) and the inner curvature (arrow) is no more than a small piece of myocardium, the bulboauricularsporn of Greil [15], between the atrioventricular canal (avc) and the aortae (ao). a, atrium; la, left atrium; ra, right atrium.