The growing embryo forms four membranes-Chorion, Amnion, Allantois and
Yolk sac.Chorion establishes connection with the walls of the uterus and
helps in the supply of nutrients to the embryo and in the removal of
wastes from the embryo. Amnion forms a sac like structure around the
embryo. The space between the amnion and embryo is filled with a fluid
called Amniotic fluid.
Amnion and amniotic fluid give protection to the
embryo against mechanical shocks. Amnion is retained till the child is
born as the embryo grows the amnion also grows in size. Another sac like
structure called Allantois is continuous with urinary bladder of
growing embryo. Yolk sac usually supposed to contain reserve food
material, but in human embryo it is vestigial and useless.
1.Draw tiny human embryo as shown.
2.Make Amnion around it as shown.
3.Draw Yolk sac and Allantois as shown.
4.Draw one more membrane around as shown, it is Chorion
5.Draw tiny projections called chorionic villi as shown and label the parts
2 comments:
Thank-you Sir for your time and effort and the wonderfully neat and detailed diagrams.
Your handwriting is admirable. once again thankyou.
plz put in utube
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