Physiology Extramedullary hematopoiesis is very common in the human fetus. At 8 months’ gestation, the most impoant site of hematopoiesis is the: A Yolk sac B Spleen C Bone marrow D Liver 💡 Explanation Extramedullary hematopoiesis is very common in the human fetus. At 8 months' gestation, the most impoant site of hematopoiesis is the: ✓ Correct Answer: C. Bone marrow