Monocytes are the largest type of white blood cell on the peripheral blood smear - 16-20 micrometers in diameter. They are the precursors of macrophages. Together, the two types of cell make up the reticulo-endothelial system.
Monocytic function includes:
Monocytes are formed in the bone marrow and emerge to form either locally-fixed macrophages in various connective tissues e.g. that of the liver, lymph nodes and central nervous system, or circulating precursors of more differentiated scavenger cells. Their circulating life is about 3 days.
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