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Get Answers to all your Questions
What is yolk sac and how it is formed?
Answers (1)
The yolk sac is one of the extra-embryonic membranes formed during the early development of the embryo. It plays an important role in nourishment and development during the initial stages of pregnancy.
Formation of Yolk Sac:
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The yolk sac is formed from the hypoblast layer (a layer of cells in the early embryo) during the second week of embryonic development.
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It develops as a small sac-like structure attached to the embryo.
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In humans, it does not contain yolk, but is still called the "yolk sac" due to its presence in other animals like birds and reptiles.
Functions of Yolk Sac in Humans:
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Early Nutrition: Provides nutrition to the embryo before the placenta is fully developed.
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Blood Cell Formation: It is the first site of blood cell formation (hematopoiesis) in the embryo.
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Formation of Germ Cells: It produces primordial germ cells, which later form sperm or egg cells.
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