Page 7, Early Development, Devel. Physiol., Dr. D. Penney

Ventricular Septation:

Through time, the common ventricle is separated into right and left chambers. In a first stage, an interventricular septum starts to grow up from the apex of the ventricle, eventually meeting the endocardial cushion located mid-stream in the atrioventricular canal (Figure 2.04A).

Eventually the septum becomes thick and muscular, but the portion near the joining point is thin and is known as the septum membranaceum (Figure 2.04B).

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