In embryo, Hemopoiesis is first demonstrable in
Yolk sac
Liver
Spleen
Bone marrow
In the early embryo, hemopoiesis is demonstrable first in the yolk sac, followed by the liver and finally bone marrow.Reference: William&;s Obstetrics; 24th edition; Chapter 7; Embryogenesis and Fetal Morphological Development
General obstetrics