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Related to prorubricyte: karyocyte, metarubricyte, polychromatophilic


a term originally used for any type of nucleated erythrocyte, but now usually limited to one of the nucleated precursors of an erythrocyte, i.e. one of the developmental stages in the erythrocytic series, in contrast to a megaloblast. In this usage, it is called also normoblast.
basophilic erythroblast a nucleated precursor in the erythrocytic series, preceding the polychromatophilic erythroblast and following the proerythroblast; the cytoplasm is basophilic, the nucleus is large with clumped chromatin, and the nucleoli have disappeared. Called also basophilic normoblast.
orthochromatic erythroblast see normoblast.
polychromatic erythroblast (polychromatophilic erythroblast) see normoblast.


Basophilic normoblast. See: erythroblast.
[pro- + rubricyte]

basophilic normoblast

A cell that is smaller (l0 to 17 µm in diameter) than a pronormoblast but similar in cellular and nuclear shape.

The chromatin is somewhat condensed; the nuclei of large or early basophilic normoblasts may reveal single nucleoli, but those of small or late basophilic normoblasts lack nucleoli; a perinuclear halo is often visible. the cytoplasm is greater in amount than in the pronormoblasts, surrounds the nucleus and is uniformly deep blue; the N:C ratio is ± 6:1.


Basophilic normoblast.
See also: erythroblast
[pro- + rubricyte]