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Updated: May 22, 2025
The flesh of it is like that of the melt or spleen, soft, red and tending something to blackness, and hath many small veins and arteries in it: and certainly the chief use of it is, for containing the child in the womb. The second is the chorion. This skin and that called the amnios, involve the child round, both above and underneath, and on both sides, which the alantois does not.
The villi of the chorion push their branches into the blood-filled tissues of the coat of the uterus, and the vessels of each loop together so intimately that it is no longer possible to separate the foetal from the maternal placenta; they form henceforth a compact and apparently simple placenta.
The innermost envelope, the amnion, encloses the foetus. Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, the allantois. The envelopes mentioned are not the only protection that the foetus has against injury. It is enveloped in fluids as well. Immediately surrounding it is the liquor amnii, and within allantois is the allantoic fluid.
Still more characteristic of the Deciduates is the peculiar and very intimate connection between the chorion frondosum and the corresponding part of the mucous coat of the womb, which we must regard as a real coalescence of the two.
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