. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 58. 62 in the umbilical vesicle and the embryo, though more abundantly in the latter. Thus the earlier stages of hematopoiesis in man seem to agree with the findings of Maximow for the rabbit and guinea-pig. The facts as far as they go support the monophyletic theory of blood-cell origin. Interpretation and Discussion. The lymphocyte is the pri- mitive blood cell descrised by Maximow (31) as "eine ubiqui- täre, indifferente, polymorphe, wandernde Mesenchymzelle". ScHRiDDE (44) seems to recognize no cell answering th
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 58. 62 in the umbilical vesicle and the embryo, though more abundantly in the latter. Thus the earlier stages of hematopoiesis in man seem to agree with the findings of Maximow for the rabbit and guinea-pig. The facts as far as they go support the monophyletic theory of blood-cell origin. Interpretation and Discussion. The lymphocyte is the pri- mitive blood cell descrised by Maximow (31) as "eine ubiqui- täre, indifferente, polymorphe, wandernde Mesenchymzelle". ScHRiDDE (44) seems to recognize no cell answering this description in his scheme of blood-cell de- velopment. In fact he expressly states that "es keine primären Wanderzellen gibt" as defined by Saxer (40) and Maximow. Maximow expresses the opinion that ScHEiDDE "die wirklich ersten Stadien der ersten Blut- bildung nicht kennt". Schridde divides the developmental pheno- mena of the first human blood cells into two stages: 1) Here intravascular primary erythro- blasts of the yolk sac and con- necting-stalk appear. These are said to arise out of the vessel- wall-cells and to increase by mitotic proliferation. 2) This begins first in an embryo of 12,5 ram. The new cells are limited absolutely to the liver. They give origin at the same instant to three distinct types of cells: myeloblasts, secondary erythroblasts and giant-cells. All. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer
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