Identify A, B, C and D in the figure given be | vedclass

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(B) The correct identification is $A-$Chorion,$B-$Amnion,$C-$Yolk sac,$D-$Allantois.Extraembryonic or Foetal Membranes:The growing embryo/foetus devel

Vedclass · Accepted Answer

$A-$Chorion,$B-$Amnion,$C-$Yolk sac,$D-$Allantois

Vedclass · Answer

(B) The correct identification is $A-$Chorion,$B-$Amnion,$C-$Yolk sac,$D-$Allantois.Extraembryonic or Foetal Membranes:The growing embryo/foetus develops four membranes called the extraembryonic or foetal membranes. These include chorion,amnion,allantois,and yolk sac.$(i)$ Chorion: It is made up of trophoblast outside and somatopleuric extraembryonic mesoderm inside. It completely surrounds the embryo and protects it. It also takes part in the formation of the placenta.$(ii)$ Amnion: It is composed of trophoblast inside and somatopleuric extraembryonic mesoderm outside. The space between the embryo and the amnion is called the amniotic cavity,which is filled with a clear,watery fluid. The amniotic fluid prevents desiccation of the embryo and acts as a protective cushion that absorbs shocks.$(iii)$ Yolk Sac: The primary yolk sac consists of endoderm inside and splanchnopleuric extraembryonic mesoderm outside. The yolk sac is non-functional in human beings except that it functions as the site of early blood cell formation.$(iv)$ Allantois: The allantois is composed of endoderm inside and splanchnopleuric extraembryonic mesoderm outside. It is a sac-like structure that arises from the gut of the embryo. In humans,the allantois is small and non-functional except for furnishing blood vessels to the placenta.

Identify $A, B, C$ and $D$ in the figure given below.

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