yolk sac in human development

[Bis-GMA111]

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can someone tell me if this is correct?

the yolk sac and allantois form the umbilical chord in humans, and the yolk sac is empty.

 

[rmm30]

Sounds good. Some stuff you might want to keep in mind. Extraembryonic membranes are characteristic of Birds, Reptiles, and Mammals. There are 4 major ones starting from outermost layer to innermost. Chorion, Allantois, Amnion, Yolk sac.

I know that the allantois eventually forms the umbilical cord in mammals but I'm not sure the yolk sac is integrated into it. You are correct about it being empty though (for mammals)

 

[IronJeff]

yolk sac produces blood cells during gestation!

source for the curious: http://en.wikivet.net/Haematopoiesis_-_Overview#Yolk_Sac_Phase