erythroblast (redirected from orthochromatic erythroblast)

erythroblast /eryth·ro·blast/ (ĕ-rith´ro-blast) originally, any nucleated erythrocyte, but now more generally used to designate a nucleated precursor cell in the erythrocytic series (q.v.). Four developmental stages in the series are recognized: the proerythroblast (q.v.), the basophilic e., in which the cytoplasm is basophilic, the nucleus is large with clumped chromatin, and the nucleoli have disappeared; the polychromatophilic e., in which the nuclear chromatin shows increased clumping and the cytoplasm begins to acquire hemoglobin and takes on an acidophilic tint; and the orthochromatic e., the final stage before nuclear loss, in which the nucleus is small and ultimately becomes a blue-black, homogeneous, structureless mass.

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e·ryth·ro·blast (-rthr-blst)

n.

Any of the nucleated cells normally found in bone marrow that develop into red blood cells.

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e·rythro·blastic adj.

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erythroblast

[erith′rəblast′]

an immature form of a red blood cell. It is normally found only in bone marrow and contains hemoglobin.

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erythroblast

originally, any nucleated erythrocyte, but now more generally used to designate the nucleated precursor from which an erythrocyte develops.

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basophilic erythroblast

see normoblast.

orthochromatic erythroblast

see normoblast, metarubricyte.

polychromatophilic erythroblast

see normoblast.