[Ref: WG21:p517-522; PK1:p235]
In foetal life, blood cells are formed in liver (mainly) and spleen
* From 6 weeks to 7 months
* Peak at 5 months
From 6-7month in foetal life
--> Bone marrow becomes the main source of haemopoiesis
By age 18-20
75% of the bone marrows belong to the white cell producing myeloid series
25% of the bone marrow are maturing red cells
NB:
Pluripotential stem cells
--> Progenitor cells (committed stem cells)
--> Blood cells
Separate pools of progenitor cells for
Stem cells also produce
Progenitor cells are produced under the influence of