By Professor Dr. Endre Kelemen, Professor Dr. Wenceslao Calvo, Professor Dr. Theodor M. Fliedner (auth.)
During the earlier two decades, celJ biology has made sizeable strides that have thoroughly reworked the universal morphological hematology of the previous day. This growth is basically as a result advent of latest suggestions which permit practical instead of anatomic experiences: labeling recommendations have made attainable the learn of celJ kinetics from delivery to demise of a celJ: tradition concepts (both in vivo and in vitro) have made it attainable to set up the progeny of sure stern celJs, their development poten tiaL and the mechanisms in their rules. the consequences were so awesome and feature so aroused the keenness 01' younger hematologists that it has turn into trendy in so me quarters to contemplate the microscope an "extinct tool" and morphology littlc greater than an outdated (if agreeable) hobby of little medical curiosity. one of many outcomes is the want of a few investigators to review cytology with no assistance from their eyes. the current e-book makes us discover once again that morphology is the technological know-how of constitution and form and that its objective isn't really to colJect images yet to appreciate them. it truly is precise that microscopic remark, even if made with the electron microscope, can't on its own resolution a few simple questions of celJ biology. besides the fact that, the hematologist who makes use of just a unmarried method is sort of a one that might describe the area from the viewpoint of a unmarried sensory organ and could refuse the help of the others.
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Additional resources for Atlas of Human Hemopoietic Development
In b, the hemopoietic cell is in the right half and in c, thc lower half of the picture. 9 a Lining cell of a yolk sac vessel of a 6-7-week-old embryo (l5-mm eR length), attaehed to an endodermal cell rieh in glyeogen. There is a disintegrating eell in the lumen. EM, x 10,500. b An apparent proerythroblast from the yolk sac of a 2I-mm embryo (7 weeks), whieh beeame strangulated by the host endodermal cells. The strangulated eell is in contact with another pro erythroblast. Both cells show rhopheocytosis.
3 a Macroscopic picture of the yolk sac attached to the 9-mm CR length embryo (5-6-week-old). Unlikc 4-5 week sampIes, this yolk sac is wellvascularized. The red-brown area above the umbilical vessel of the embryo is the liver. b Overview of the yolk sac from a 14-mm CR length embryo. The empty middle area is the yolk sac cavity. The two inner layers show yolk sac endoderm and the two outer layers (upper and /oll'er margins of the picture) show the outer mesothelial surface. Between the two layers one can see loose mesenchym al tissue, with relatively large vessels, containing primitive erythroblasts (/oll'er part) and several denuc1eated red cells (upper part).
In the later stages of development, there is a continuing shift in the differential count from the very early to the later stages 01' primitive erythroblast development. In the 7-10-week-old embryo nie blood there is a preponderance 01' mature nucleated primitive erythrocytes. As can be seen, the differential count is now almost reversed as compared to the earlier ages, with over 70°;;) 01' aU cells belonging to the most mature stages, type 111 and post-type II!. It is shortly after this stage 01' development of hemopoiesis 22 DIFFUSE HEMOPOIcSIS Table I.