. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 56 Lumen Nachdruck verboten. A microscopic Study of tlie Umbilical Vesicle of a 13 mm hnmau Embryo, with special reference to the entodermal Tubules and the Blood Islands. By H. E. Jordan, A. M., Ph. D., Associate professor of Anatomy, University of Virginia, U. S. A. V^ith 12 Figures. (Schluß.) The mesenchyme has at first a syncytial character (Figs. 10 and 11). Large oval more or less irregular nuclei with pale staining nucleoli and a deep staining network with net-knots lie scattered throughout a delicately fibrillar and v
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 56 Lumen Nachdruck verboten. A microscopic Study of tlie Umbilical Vesicle of a 13 mm hnmau Embryo, with special reference to the entodermal Tubules and the Blood Islands. By H. E. Jordan, A. M., Ph. D., Associate professor of Anatomy, University of Virginia, U. S. A. V^ith 12 Figures. (Schluß.) The mesenchyme has at first a syncytial character (Figs. 10 and 11). Large oval more or less irregular nuclei with pale staining nucleoli and a deep staining network with net-knots lie scattered throughout a delicately fibrillar and vacuolated protoplasm. In such an area about to become a blood island cell out- lines appear in the mesenchyme. Peripherally to such a mass the nuclei of the undifferentiated mes- enchyme arrange themselves in rows (Fig. 10) and eventually form the endothelial wall of developing blood vessels. The nuclei of the mes- enchymal syncytium are vesicular. Immediately the cells arise, the nuclei become smaller, stain more intensely and have an oval or kidney- shaped form (Fig. 11 b^). These are the primitive blood cells or hematogonia of Maximow. Their offspring contain large spheric inten- sely staining nuclei, and possess a very narrow shell of basophile cytoplasm (lymphocyte — Fig. 11 b^). They are characteristically amoeboid as seen by their pseudopodia (Fig. 12 b^). This cell or its offspring rounds up and their nuclei become spheric and slightly less chromatic. «'—^i. Fig. 10. Drawiug of a blood island of two cells (noi'moblasts) from the mes- enchj^me of the older vesicle. The normo- blasts appear capable of amoeboid motion. The pseudopodia at the right seem to merge into the connective tissue syn- cytium. A capillary lumen is beginning to form. Two stages in the metamor- phosis of mesenchj'^me cells into "lympho- cytes" (Maximow) are also shown. X 1500. Reduced V4 ^^ Please note that these images are extracted from scanned page images that may hav
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