Foetal Membranes
Definition

Foetal Membranes
o        The foetal membranes are the amnion and chorion
o        The foetal membranes cover the foetus from the earliest stage until term.
o        The first membrane to form is the chorion; later the amnion is formed.
o        At birth they are seen on the surface of the placenta.


Amnion
o        Formed by the epiblast of the inner cell mass
o        The amnion is a membranous sac which surrounds and protects the embryo
o        Formed by the end of second week
o        Contains liquor amnii
o        Surrounds the foetus. Foetus floats in the liquor amnii
o        Amnion enlarges and fills the whole uterus obliterating the chorionic cavity
o        Amnion and chorion fuse later
o        Amnion breaks and discharges the liquor at the time of delivery

Chorion
o        Chorion is formed by the trophoblast
o        Chorion contains the chorionic cavity (extraembryonic cavity)
o        The expanding amniontic cavity fills the chorionic cavity and completely obliterates it; the amniotic membrane fusing with the chorion. Amniochorionic membrane is formed
o        The part of the chorion at the embryonic pole of the human embryo is called the chorion frondosum. The part away from the embryonic pole is called  chorion laeve.
o        The chorion at or near the placenta contains vessels of the placenta
































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Topic index -    Embryology    -     fetal membranes        e
Amnion with fetus inside
Nine week embryo
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Embryology
fetal membranes      amnion   graafian follicle  chorion       i












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