Page 9, Early Development, Devel. Physiol., Dr. D. Penney




The Cardiac Valves:

The 4 cardiac valves, two A-V and two semilunar, develop from the endocardial tissue, guaranteeing unidirectional flow of blood (Figure 2.06). The A-V valves develop from endocardial cushions at the A-V canal, while the semilunar valves (aortic & pulmonic) develop from endocardial tissue involved in the spiral separation just described, and secondary mounds on the opposite sides of the channels.


To review adult heart structure


Next Page

Previous Page

Return to Index