Bilaminar embryo. Formation of ecto- and endoderm.

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Bilaminar embryo. Formation of ecto- and endoderm. Dr. Altdorfer

https://www.youtube.com/watch?v=bIdJOiXpp9g https://www.youtube.com/watch?v=3AOoikTEfeo Online course in embryology for medicine students universities of Fribourg, Lausanne, Bern with the support of the Swiss Virtual Campus http://www.embryology.ch/

embryoblast Immunological defence blastocoel Blastula, blastocyst

Operculum

blastula

embryoblast

Amnion-fluid (mech. protection) Primary yolk sac

hCG

--> Chorionic plate

Extraembr. somatopleura Extraembr. splanchnopleura

Bilaminar embryo

Embryonic disc Epiblast  all the 3 germ layers!!

Epiblast  all the 3 germ layers!! Cloaca-membran

all embryonic tissues derive from the epiblast

Embryo, amnion Yolk sac Placenta

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