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 CVS Embryology Q1  

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Since no separate option for embryology, I am posting these Embryology questions here for discussion...

1. During embryological development, hematopoiesis occurs in different organs at different times. Which of the following are the correct organs, in the correct sequence, at which hematopoiesis occurs embryologically?

A. Amnion, yolk sac, placenta, bone marrow

B. Placenta, liver and spleen, yolk sac, bone marrow

C. Placenta, spleen and lymphatic organs, bone marrow

D. Yolk sac, bone marrow, liver and spleen

E. Yolk sac, liver, spleen and lymphatic organs, bone marrow

Edited by Venus6 on Mar 29, 2010 - 2:10 PM


E. Yolk sac, liver, spleen and lymphatic organs, bone marrow





Yes! The correct answer is E. By the third week of development, hematopoiesis begins in the blood islands of the yolk sac. Beginning at 1 month of age and continuing until 7 months of age, blood elements are also formed in the liver. Hematopoiesis occurs in the spleen and lymphatic organs between 2 and 4 months, and in the bone marrow after 4 months.


to remember - young liver synthesizes blood
yolk sac, liver, spleen, bone

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