Myelocyte
Details
PrecursorPromyelocyte
Gives rise toMetamyelocyte
LocationBone marrow
Identifiers
THH2.00.04.3.04004
FMA83525
Anatomical terms of microanatomy
Basophilic[1]
Eosinophilic[2]
Neutrophilic[3]

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

Structure

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. 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.)

Measurement

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

Development

Promyelocyte → Myelocytes → metamyelocytes.

Additional images

References

  1. ↑ Histology image:01809loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide. Oxford University Press. ISBN 978-0195151732.
  2. ↑ Histology image:01810loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide. Oxford University Press. ISBN 978-0195151732.
  3. ↑ Histology image:01804loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide. Oxford University Press. ISBN 978-0195151732.
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