BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
HEMATOPOIESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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At which phase does the extramedullary hematopoiesis occurs in the yolk sac?
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Mesoblastic phase
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Hepatic phase
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Medullary phase
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Mesothermal phase
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Explanation:
Detailed explanation-1: -Mesoblastic hematopoiesis occurs in extraembryonic structures, principally in the yolk sac, and begins between the 10th and 14th days of gestation.
Detailed explanation-2: -Mesoblastic Phase (Yolk Sac Phase) Hematopoiesis is considered to begin around the nineteenth day of embryologic development after fertilization. Progenitor cells of mesenchymal origin migrate from the aorta-gonad-mesonephros region of the developing aorta-splanchnopleure to the yolk sac.
Detailed explanation-3: -Extramedullary hematopoiesis (EMH or sometimes EH) refers to hematopoiesis occurring outside of the medulla of the bone (bone marrow).
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