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connecting stalk
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Atlas 2-2
Atlas 3-1-2
Atlas 3-2-1
Atlas 3-2-2
Atlas 4-1
Atlas 4-2
Other than enlargement, no significant changes occur in the first half of the third week in the secondary yolk sac, amnion and connecting stalk. The allantois extends farther into the connecting stalk at the caudal end of the disc.
Source:
Atlas of Human Embryos
.