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This is a clear and simple presentation for the use of medical students of the facts and point of view which are essential for any understanding of human anatomy. It is prefaced by an excellent discussion of the physiology of reproduction in mammals as it is understood at the present moment. The theorizing and comparisons so dear to the heart of the embryologist are reduced to a minimum. This goes too far sometimes. The human yolk sac, for example, is dismissed as a "relic." At the eight weeks stage, to be sure, it seems to be nothing more than a useless vestige, but when one considers that during the third and fourth weeks the embryo takes form as it is spread out on the surface of the yolk sac precisely as in reptiles and birds, it is obvious that the yolk sac could not have dropped out of the life
The Essentials of Human Embryology. JAMA. 1938;111(21):1956-1957. doi:10.1001/jama.1938.02790470068028