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A comprehensive diagram of human hematopoiesis. Granulopoiesis consists of 5 stages, in which the myeloblast is the first recognizable cell. Next in the differentiation sequence is the monoblast and the promyelocyte, which can develop into one of three different precursor cells: the neutrophilic, basophilic or eosinophilic myelocyte.
When stained with the usual dyes, the cytoplasm is distinctly basophilic and relatively more abundant than in myeloblasts or promyelocytes, even though myelocytes are smaller cells. Numerous cytoplasmic granules are present in the more mature forms of myelocytes.
The word myelopoiesis has several senses in a way that parallels those of myeloid, and myelopoiesis in the narrower sense is the regulated formation specifically of myeloid leukocytes (myelocytes), allowing that sense of myelopoiesis to be contradistinguished from erythropoiesis and lymphopoiesis (even though all blood cells are normally ...
In hematology, myelopoiesis in the broadest sense of the term is the production of bone marrow and of all cells that arise from it, namely, all blood cells. [1] In a narrower sense, myelopoiesis also refers specifically to the regulated formation of myeloid leukocytes (), including eosinophilic granulocytes, basophilic granulocytes, neutrophilic granulocytes, and monocytes.
WHO defined CMML has two main subsets, CMML-1 and CMML-2. CMML-1 is diagnosed if myeloblasts, monoblasts and promonocytes are <5% of peripheral blood and <10% of bone marrow. CMML-2 is diagnosed if: Myeloblasts, monoblasts or promonocytes are 5-19% in blood, or; Myeloblasts, monoblasts or promonocytes are 10-19% in bone marrow, or; Auer rods ...
A promyelocyte (or progranulocyte) is a granulocyte precursor, developing from the myeloblast and developing into the myelocyte.Promyelocytes measure 12–20 microns in diameter.
Conventionally, a leukocytosis exceeding 50,000 WBC/mm 3 with a significant increase in early neutrophil precursors is referred to as a leukemoid reaction. [2] The peripheral blood smear may show myelocytes, metamyelocytes, promyelocytes, and rarely myeloblasts; however, there is a mixture of early mature neutrophil precursors, in contrast to the immature forms typically seen in acute leukemia.
Comparison of monoblast, promonocyte and monocyte. A typical monoblast is about 12 to 20 μm in diameter, has a nuclear to cytoplasm ratio of 4:1 to 3:1, and, like most myeloid blasts, has a round to oval nucleus with fine chromatin structure.
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