Leukopoiesis

Leucopoiesis/Leukopoiesis

Leucopoiesis/leukopoiesis is formation of leucocytes.

Leucopoiesis is the process of production of WBCs.

Leukocytes originate from hemocytoblasts of blood forming bone marrow. Leucopoiesis also occur throughout body in lymph tissues such as; 

lymph nodes, spleen and tonsils.

Hemocytoblast; present in bone marrow.

Myeloblast            Lymphoblast         Monoblast

Progranulocyte    Lymphocytes         Monocytes

                                           Agranulocytes

Basophilic myelocyte      Eosinophilic  myelocyte       Neutrophilic myelocyte

Basophilic band cell        Eosinophilic band cell          Neutrophilic band cell

Basophil                            Eosinophil                              Neutrophil

Granulocytes

Lymphocytes originate from hemocytoblasts from bone marrow and migrate to the blood from blood circulation. It invade lymphoid tissue and establish colonies and after invading lymphoid tissue. They produce additional lymphocytes, without involving bone marrow.

Life span of leucocyte

About 13-20 days