Polymorphonuclear Lymphocytes

Polymorphonuclear leukocytes (PMN), or granulocytes, are a type of white blood cell. They arise from the myeloid cell line in the bone marrow and help the body to fight infection.

PMNs include neutrophils, basophils and eosinophils, which circulate in the bloodstream, as well as mast cells, which reside in the tissues. Their primary role is to digest any foreign invaders.

PMNs are referred to as granulocytes because of their appearance under the microscope. When they are stained for examination, the cytoplasm of the cell takes on a grainy appearance. (from about.com)

Image Source T.R. Nurkiewicz via amolecularmatter tumblr (link)

PMNLs (polymorphonuclear leukocytes) in a human trapezius muscle venule after pulmonary particulate matter exposure. Venules are very small blood vessels in the microcirculation that allow deoxygenated blood to return from capillary beds into larger veins.

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