Topic 1.1 - Haemopoiesis

Question 1

Define haemopoiesis

Answer 1

dynamic process of blood cell production & development

Question 2

What are the haemopoietic sites and when do they start?

Answer 2

1. Yolk Sac
   - extramedullary
   - for the first 2 months
2. Liver and Spleen
   - extramedullary
   - starts in the 5th/6th
   - finished by birth
3. Bone Marrow
   - medullary
   - begins at 5 month
   - ALL bone marrow active at birth
   - progressively restricts to the axial skeleton