Monoblasts are the committed progenitor cells that differentiated from myeloid stem cell in the process of hematopoiesis. They are normally found in bone marrow and do not appear in the normal peripheral blood.[1] They mature into monocytes which, in turn, develop into macrophages.[2]

SystemImmune system
LocationBone marrow
FunctionA precursor monocyte
Anatomical terms of microanatomy


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. One to four nucleoli are usually visible. The nucleus can be central or eccentric and it can show evidence of indentation or folding. The cytoplasm stains moderately to lightly basophilic and may contain small azurophilic granules.[2][3]


The monoblast is the first stage of monocyte-macrophage maturation. The developmental stages of the monoblast are: CFU-GM (pluripotential hemopoietic stem cell or hemocytoblast) -> monoblast -> promonocyte -> monocyte-> macrophage.[2][4]

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See also


  1. Abbas, Abul K. (2012). Cellular and molecular immunology. Lichtman, Andrew H., Pillai, Shiv. (7th ed.). Philadelphia: Elsevier/Saunders. ISBN 9781437715286. OCLC 698580696.
  2. Mescher, Anthony L.,. Junqueira's basic histology : text and atlas. Junqueira, Luiz Carlos Uchôa, 1920- (Thirteenth ed.). New York. ISBN 9780071807203. OCLC 854567882.CS1 maint: extra punctuation (link) CS1 maint: multiple names: authors list (link)
  3. Color atlas of hematology : an illustrated field guide based on proficiency testing : peripheral blood. Glassy, Eric F.,, Hematology and Clinical Microscopy Resource Committee, (Second ed.). Northfield, Illinois. ISBN 9781941096390. OCLC 1023810216.CS1 maint: extra punctuation (link) CS1 maint: others (link)
  4. Ross, Michael H. (2011). Histology : a text and atlas : with correlated cell and molecular biology. Pawlina, Wojciech. (6th ed.). Philadelphia: Wolters Kluwer/Lippincott Williams & Wilkins Health. ISBN 9780781772006. OCLC 548651322.

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