Veterinary Immunology and Serology

CELLS OF IMMUNE SYSTEM

• The cells of immune system are normally present as circulating cells in the blood and lymph, as anatomically defined collections in lymphoid organs and a scattered cell in almost all tissues.
• Stem cells are undifferentiated cells that divide continuously and give rise to additional stem cells and to cells of multiple different lineages of hematopoietic system.
• Origins of cells of hematopoietic and immune systems are as below