Leukocytes, also known as white blood cells, are a central part of the immune system. They help to protect the body against foreign substances, microbes, and infectious diseases. These cells are produced or stored in various locations throughout the body, including the thymus, spleen, lymph nodes, and bone marrow.

Where are leukocytes found in the body?

All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Leukocytes are found throughout the body, including the blood and lymphatic system.

Where are most leukocytes found?

White blood cells are made in the bone marrow. They are stored in your blood and lymph tissues. Because some white blood cells called neutrophils have a short life less than a day, your bone marrow is always making them.