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20
Bone Marrow
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Slide 20: Smear - medium power - heteromorphic field, note cells of different series; cells with small dense nuclei are of erythroid line; the larger cells, some of which have granules in their cytoplasm, represent different stages of granulocyte maturation. To be elaborated upon in subsequent slide - all are from marrow smears. Note that white cell precursors greatly outnumber red cell precursors even though the situation is just the opposite in the peripheral circulation. This is because for the most part the white cells (especially neutrophils) last only a few days while red cells, on average, live 120 days.