myelocyte

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('ə-lə-sīt') pronunciation
n.
A large cell of the bone marrow that is a precursor of the mature granulocyte of the blood.

myelocytic my'e·lo·cyt'ic (-sĭt'ĭk) adj.


a nucleated cell of the bone marrow that is a precursor of the granulocytes of the blood.

Previous:myeloblast, myelo+, myelination
Next:myeloid, myeloma, myeloma protein

1. a precursor in the granulocytic series intermediate between a promyelocyte and a metamyelocyte, normally occurring only in the bone marrow. In this stage, differentiation into specific cytoplasmic granules has begun.
2. any cell of the gray matter of the nervous system.

(mi′ ə-lo-sīt)
n

A young white blood cell found in the bone marrow.

Myelocyte
Code TH H2.00.04.3.04004
Basophilic[1]
Eosinophilic[2]
Neutrophilic[3]

A myelocyte is a young cell of the granulocytic series, occurring normally in bone marrow, but not in circulating blood (except when caused by certain diseases).

Contents

Histology

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 myelocyte, 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.)

Maturation

Myelocytes are derived from promyelocytes and give rise to metamyelocytes.

Measurement

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

Additional images

References

External links


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