Granulocytes are a category of white blood cells characterized by the presence of granules in their cytoplasm. They are also called polymorphonuclear leukocytes (PMN or PML) because of the varying shapes of the nucleus, which is usually lobed into three segments. In common parlance, the term polymorphonuclear leukocyte often refers specifically to neutrophil granulocytes, the most abundant of the granulocytes. Granulocytes or PMN are released from the bone marrow by the regulatory complement proteins. (from wikipedia)
Image from Wellcome Images photo credit: University of Edinburgh Creative Commons by-nc-nd 2.0 UK: England & Wales
Colour-enhanced transmission electron microscope image of a polymorphonuclear leucocyte or neutrophil. This type of white blood cell has many lobes to its nucleus – four can be seen here in white/green. The nuclear membrane is highlighted in red. Neutrophils are mainly involved in ingesting and destroying small organisms such as bacteria.
Transmission electron micrograph 1980 – 2002