Placenta and Fetal Membranes Notes | EduRev

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: Placenta and Fetal Membranes Notes | EduRev

 Page 1


Placenta and Fetal Membranes
Amnion - Epiblast / Extraembryonic Mesoderm
Yolk Sac - Hypoblast / Extraembryonic Mesoderm
Allantois - Embryonic Hindgut
Chorion - Trophoblasts / Extraembryonic Mesoderm 
Placenta - Chorion / Maternal Decidua 
Page 2


Placenta and Fetal Membranes
Amnion - Epiblast / Extraembryonic Mesoderm
Yolk Sac - Hypoblast / Extraembryonic Mesoderm
Allantois - Embryonic Hindgut
Chorion - Trophoblasts / Extraembryonic Mesoderm 
Placenta - Chorion / Maternal Decidua 
Amnion
Amnionic membrane is two cell layers
1) epiblast derived extraembryonic ectodermal layer
2) thin non-vascular extraembryonic mesoderm
As the amnion enlarges it encompasses the embryo on the 
ventral side, merging around the umbilical cord.
Amnion forms the epithelial layer of the umbilical cord 
With embryo growth the amnion obliterates the chorionic
cavity
Amnionic sac is fluid filled called amnionic fluid: the 
embryo is bathed in the fluid 
Page 3


Placenta and Fetal Membranes
Amnion - Epiblast / Extraembryonic Mesoderm
Yolk Sac - Hypoblast / Extraembryonic Mesoderm
Allantois - Embryonic Hindgut
Chorion - Trophoblasts / Extraembryonic Mesoderm 
Placenta - Chorion / Maternal Decidua 
Amnion
Amnionic membrane is two cell layers
1) epiblast derived extraembryonic ectodermal layer
2) thin non-vascular extraembryonic mesoderm
As the amnion enlarges it encompasses the embryo on the 
ventral side, merging around the umbilical cord.
Amnion forms the epithelial layer of the umbilical cord 
With embryo growth the amnion obliterates the chorionic
cavity
Amnionic sac is fluid filled called amnionic fluid: the 
embryo is bathed in the fluid 
Extraembryonic Tissues
8 days
9 days
14 days
Page 4


Placenta and Fetal Membranes
Amnion - Epiblast / Extraembryonic Mesoderm
Yolk Sac - Hypoblast / Extraembryonic Mesoderm
Allantois - Embryonic Hindgut
Chorion - Trophoblasts / Extraembryonic Mesoderm 
Placenta - Chorion / Maternal Decidua 
Amnion
Amnionic membrane is two cell layers
1) epiblast derived extraembryonic ectodermal layer
2) thin non-vascular extraembryonic mesoderm
As the amnion enlarges it encompasses the embryo on the 
ventral side, merging around the umbilical cord.
Amnion forms the epithelial layer of the umbilical cord 
With embryo growth the amnion obliterates the chorionic
cavity
Amnionic sac is fluid filled called amnionic fluid: the 
embryo is bathed in the fluid 
Extraembryonic Tissues
8 days
9 days
14 days
Page 5


Placenta and Fetal Membranes
Amnion - Epiblast / Extraembryonic Mesoderm
Yolk Sac - Hypoblast / Extraembryonic Mesoderm
Allantois - Embryonic Hindgut
Chorion - Trophoblasts / Extraembryonic Mesoderm 
Placenta - Chorion / Maternal Decidua 
Amnion
Amnionic membrane is two cell layers
1) epiblast derived extraembryonic ectodermal layer
2) thin non-vascular extraembryonic mesoderm
As the amnion enlarges it encompasses the embryo on the 
ventral side, merging around the umbilical cord.
Amnion forms the epithelial layer of the umbilical cord 
With embryo growth the amnion obliterates the chorionic
cavity
Amnionic sac is fluid filled called amnionic fluid: the 
embryo is bathed in the fluid 
Extraembryonic Tissues
8 days
9 days
14 days
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