Later Development, Develop. Physiol., Dr. D. Penney
Table 3.08 - Hematopoiesis - Sites of Blood Formation during Development in Chronological Order of Appearance.
- Yolk sac - 4th week; ends 2nd mo.
- Body mesenchyme and blood vessels - 5th week
- Liver - 6th week; ends at birth
- Spleen, thymus and lymph glands - and - 4th mo.
- Bone marrow - 4th mo.; dominant by 5th mo.
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