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Morphological Aspects of Prenatal Haematopoietic Development in the Cat

The appearance of haematopoietic cells and the development of haematopoiesis in certain embryonic organs of the cat were studied using light microscopic (cytological smears and paraffin embedded tissues) and transmission electron microscopic methods. Primitive erythropoiesis occurred predominantly in the yolk sac whereas definitive erythropoiesis occurred in the yolk sac, liver, bone marrow and, to a lesser extent, in the spleen. In the yolk sac, erythropoiesis was predominantly intravascular whereas in the liver and bone marrow it was usually extravascular. Granulopoiesis occurred mainly in the liver and bone marrow. In the liver it was predominantly extravascular and occurred around vessels, bile ducts and in perisinusoidal spaces. Megakaryocytopoiesis occurred in the yolk sac, liver, bone marrow and spleen. The megakaryocytic line of cells were similar to those occurring in adult cats except that in the yolk sac unusual small, mononuclear to binuclear thrombocytogenic megakaryocytes were present also.