The development of the human body; a manual of human embryology . Fig. 122.—The Vascular Areas op Rabbit Embryos. In B the Veinsare Represented by Black and the Network is Omitted.—{van Beneden and Julin.) So long as the formation of blood-vessels is taking placein the extra-embryonic mesoderm, so long are new ery-throcytes being differentiated from the mesoderm. Butwhether the formation of blood-vessels within the embryoresults from a differentiation of the embryonic mesodermin situ, or from the actual ingrowth of vessels from theembryonic regions (His), is as yet uncertain, and henceit is al
The development of the human body; a manual of human embryology . Fig. 122.—The Vascular Areas op Rabbit Embryos. In B the Veinsare Represented by Black and the Network is Omitted.—{van Beneden and Julin.) So long as the formation of blood-vessels is taking placein the extra-embryonic mesoderm, so long are new ery-throcytes being differentiated from the mesoderm. Butwhether the formation of blood-vessels within the embryoresults from a differentiation of the embryonic mesodermin situ, or from the actual ingrowth of vessels from theembryonic regions (His), is as yet uncertain, and henceit is also uncertain whether erythrocytes are differentiated 244 THE DEVELOPMENT OF THE HUMAN BODY. from the embryonic mesoderm or merely pass into theembryonic region from the more peripheral areas. How-ever this may be, it is certain that the erythrocytes in-crease by division in the interior of the embryo, and thatthere are certain portions of the body in which these divi-sions take place most abundantly, partly, perhaps, onaccount of the more favorable conditio
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
