Page 208 - Atlas of Histology with Functional Correlations

macrophages in the spleen, liver, and bone marrow.

Figure 6.6 | Eosinophil

Eosinophils (1) are identified in a blood smear by their cytoplasm that is filled
with distinct, large, eosinophilic (bright pink) granules. The nucleus in

eosinophils (1) is typically bilobed, but a small third lobe may be present.

Eosinophils (1) constitute approximately 2% to 4% of blood leukocytes.

FIGURE 6.6 ■ Eosinophil. Stain: Wright stain. Oil immersion.

Figure 6.7 | Lymphocytes

Agranular leukocytes contain few cytoplasmic granules and exhibit round to
horseshoe-shaped nuclei. Lymphocytes (1, 2) vary in size from cells smaller

than erythrocytes to cells almost twice as large. For a size comparison between
lymphocytes and erythrocytes, this illustration of a human blood smear depicts a
large lymphocyte (1) and a small lymphocyte (2) surrounded by the red-

staining erythrocytes. In small lymphocytes (2), the densely stained nucleus
occupies most of the cytoplasm, which appears as a thin basophilic rim around
the nucleus. The cytoplasm in lymphocytes is usually agranular but may
sometimes contain a few granules. In large lymphocytes (1), the basophilic
cytoplasm is more abundant, and the larger and paler nucleus may contain one or

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