Nikolas
Created page with "== Learning objectives == * From which embryonic tissue does blood and blood vessels develop from? * Where do the first blood cells of the foetus arise? * Where do the definitive blood cells originate from? * What is the first major haematopoietic organ in the foetus, and for how long does it remain as the major organ? * What is the definite major haematopoietic organ? * What are the two mechanisms by which blood vessels are formed? * What is vasculogenesis, and which m..."