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'''Haemopoiesis''' is the formation of blood cellular components. All cellular blood components are derived from haematopoietic stem cells.

'''Haemopoiesis''' is the formation of blood cellular components. All cellular blood components are derived from haematopoietic stem cells.

Blood cells form in the bone marrow (predominant site for [[Erythrocytes|erythrocytes]] and granulocytes), spleen and, in early life, the liver. The myeloid stem cells are multipotential cells, giving rise to all the cell types found in the bone marrow.  

Blood cells form in the bone marrow (predominant site for [[Erythrocytes - Reptile|erythrocytes]] and granulocytes), spleen and, in early life, the liver. The myeloid stem cells are multipotential cells, giving rise to all the cell types found in the bone marrow.  

==Bone Marrow and Haemopoietic tissue==

==Bone Marrow and Haemopoietic tissue==

Haematopoietic tissue is found widely in the bones of reptiles, including the vertebral bodies and ribs of snakes. This tissue is similar to that of birds and mammals. Extramedullary haemopoiesis may occur in the spleen and liver, with some [[Erythrocytes|erythrocytes]] dividing mitotically in the bloodstream or after recirculation through the bone marrow, in order to create more [[Erythrocytes|erythrocytes]] during periods of chronic anaemia.

Haematopoietic tissue is found widely in the bones of reptiles, including the vertebral bodies and ribs of snakes. This tissue is similar to that of birds and mammals. Extramedullary haemopoiesis may occur in the spleen and liver, with some [[Erythrocytes - Reptile|erythrocytes]] dividing mitotically in the bloodstream or after recirculation through the bone marrow, in order to create more [[Erythrocytes - Reptile|erythrocytes]] during periods of chronic anaemia.

==Spleen==

==Spleen==