ight branch disappears. The ascending portion of the arch of the aorta, and the root of the pulmo- nary artery, are at first blended together in the common dilatation (aortic sinus), which has been above spoken of as connected with the ventricular end of the rudimentary heart (Fig. 61, 1). The… … Diagram of the formation of the aortic arches and the large arteries. I. II. III. IV. V. First, second, third, fourth and fifth aortic arches. A. Common trunk from which the first pair spring; the place where the succeeding pairs are formed is indicated by dotted lines. B. Common trunk, with four…
Human anatomy
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