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What are Extra embryonic membranes? Mention their location. Explain their structure and functions.

Answer»

The extra embryonic membranes include amnion, yolk sac, allantois and chorion. They protect the embryo from dessication, mechanical shock, absorption of nutrients, gaseous exchange and placental formation.

Embryonic membraneFunction
AmnionInner most two layered membrane with amniotic fluid providing buoyancy to embryo from injury, regulates temperature and acts as medium for foetal movement
ChorionOutermost layer covering and protecting the embryo.
AllantoisForms a out pocketing of embryonic tissue at the tail of yolk sac which forms umbilical cord that links embryo to placenta and finally becomes the part of urinary bladder.
Yolk sacForms a part of gut and acts a source of earliest blood cells and blood vessels.


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