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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 4 - Blood

Plate 4.59: Bone Marrow

Developing eosinophils

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed

Developing eosinophils

Plate 4.59: Bone Marrow

Human, air-dried marrow smear, Wright's stain, 1416 x.

Myeloblast: Stem cell of the leucocytic series. It has a rounded large nucleus and lightly basophilic agranular cytoplasm. See also Plate 58.

Eosinophilic myelocyte: These develop from myeloblasts. Specific acidophilic granules appear in cytoplasm. The nucleus is rounded or oval. Chromatin of nucleus is coarser than in the myeloblast. This cell is capable of division.

Eosinophilic metamyelocyte: This cell is no longer capable of cell division. The nucleus is kidney- shaped or indented. Cytoplasm contains acidophilic granules.

Eosinophilic band: Immature or juvenile eosinophil. The nucleus is horseshoe- or drumstick-shaped, and there are eosinophilic granules in cytoplasm.

Segmented eosinophil: Mature eosinophil. The nucleus is lobulated and the lobes are connected with thin chromatin threads. There is abundant granular cytoplasm.

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