Hematopoietic tissue is where new blood cells are formed in the body. The blood cells in the hematopoietic tissue have both long-term and short-term regeneration capacities. Hematopoietic tissue is where hematopoietic stem cells are located.
Hematopoietic stem cells are found in larger quantities within the bones located in the pelvis, femur and sternum. The hematopoietic stem cell appearance is small in size compared to other blood cells and round in shape. Myeloid-biased, lymphoid-biased and balanced (Bala) are the three classes of hematopoietic stem cells found in the bones and blood. Each class is distinguished by their ratio of lymphoid to myeloid progeny in the blood.