Erythropoiesis in gestation age takes place in: (A) Yolk sac, (B) Placenta, (C) Amniotic sac, (D) Chorion
Answer is A. In the first 2 months of gestation yolk, sac is the main site of Erythropoiesis(mesoblastic stage) Ref: Medical Physiology Indu Khurana 2015 page No:104 In early weeks of embryonic life, primitive nucleated red cells are producedin yolk sac. During middle trimester of gestation-liver (also spleen,lymph nodes in reasonable numbers) During last month of gestation and after bih- exclusively in the bone marrow