Myelocyte

 ( Leukocytes ) 

A myelocyte is a young cell of the Granulocyte series, occurring normally in bone marrow (can be found in circulating blood when caused by certain diseases).

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Structure When stained with the usual dyes, the cytoplasm is distinctly basophilic and relatively more abundant than in or , even though myelocytes are smaller cells.

Numerous cytoplasmic granules are present in the more mature forms of myelocytes. Neutrophilic and eosinophilic granules are peroxidase-positive, while basophilic granules are not.

The nuclear chromatin is coarser than that observed in a promyelocyte, but it is relatively faintly stained and lacks a well-defined membrane.

The nucleus is fairly regular in contour (not indented), and seems to be 'buried' beneath the numerous cytoplasmic granules. (If the nucleus were indented, it would likely be a metamyelocyte.)

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Measurement There is an internationally agreed method of counting blasts, with results from M1 upwards.

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Development Promyelocyte → Myelocytes → .

==Additional images==

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See also

• Myeloid tissue

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External links

• Neutrophilic Myelocyte Presented by the University of Virginia
• Eosinophilic Myelocyte Presented by the University of Virginia
• Basophilic Myelocyte Presented by the University of Virginia
• Image at queensu.ca

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