A crenated erythrocyte is indicated by the arrow. This mature neutrophil contains a segmented nucleus. The cytoplasm is pale staining with pale granules. The cytoplasm of this eosinophil contains bright red granules which are characteristic of the cell.
Monocytes are generally the largest leukocyte.
The nucleus of this monocyte is horseshoe-shaped. The cytoplasm contains numerous vacuoles. Small lymphocytes have a round, dense, heterochromatic nucleus with pale blue cytoplasm and occasional azurophilic granules. The large lymphoctye has more cytoplasm. This is called rouleau formation.