In embryo, Hemopoiesis is first demonstrable in
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
Yolk sac
Liver
Spleen
Bone marrow
General obstetrics