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yolk sac
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Labeled diagram of an amniotic egg showing the embryo surrounded by membranes including the amnion, chorion, yolk sac, and allantois, with albumin, amniotic fluid, yolk, and shell also identified. Diagram showing three stages in early human embryonic development: the growth of the amnion at 23 days, a back view of an embryo at 21 days with the amnion cut open revealing neural structures, and a side view at 23 days with the yolk sac and amnion cut open, highlighting the heart, brain, spinal cord, and umbilical blood vessels.
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Amniotic egg.
Encyclopædia Britannica, Inc.
human embryonic development
Development of the human embryo at 23 days.
Encyclopædia Britannica, Inc.