Myelocyte

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title: "Myelocyte" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["leukocytes"] description: "Young granulocytic white blood cell" topic_path: "general/leukocytes" source: "https://en.wikipedia.org/wiki/Myelocyte" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Young granulocytic white blood cell ::

::data[format=table title="Infobox cell"]

Field	Value
Name	Myelocyte
Image	Hem1Myelocyte.jpg
Precursor	Promyelocyte
GivesRiseTo	Metamyelocyte
Location	Bone marrow
::

| Name = Myelocyte | Latin = | Image = Hem1Myelocyte.jpg | Caption = | Image2 = | Caption2 = | System = | Artery = | Vein = | Nerve = | Lymph = | Precursor = Promyelocyte | GivesRiseTo = Metamyelocyte | Location = Bone marrow ::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/10/Basophilic_myelocyte.png" caption="inline=1}}"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/3/30/Eosonophilic_myelocyte.png" caption="inline=1}}"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/0/07/Neutrophilic_myelocyte.png" caption="inline=1}}"] ::

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

File:Hematopoiesis (human) diagram en.svg|Hematopoiesis

References

References

1. {{BUHistology. 01809loa
2. {{BUHistology. 01810loa
3. {{BUHistology. 01804loa

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::