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Updated: May 9, 2025
One of them, the retention of placental tissue, has just been mentioned, but serious consequences resulting from it are almost inexcusable, for, although the placenta may separate less readily and be cast off less thoroughly after miscarriage, modern medical skill can successfully cope with such conditions. Another fruitful source of unfortunate after-effects is the imprudence of the patient.
So far as is known; the umbilical cord performs no service other than to link the blood-vessels in the placenta with those in the fetus. Simple as this may seem, it is of paramount importance in maintaining the life of the fetus, for compression of the vessels in the cord would shut off its nutriment.
This cord is a part of what is called the umbilical cord, and it is this that joins the embryo to the mother. These branching structures are loops of blood-vessels, and they form part of the placenta, or "afterbirth." Through this cord the embryo receives its nourishment from the mother.
The placenta shows a real affinity for some toxic substances; in it accumulate copper and mercury, but not lead, and it is therefore through it that the poison reaches the fetus; in addition to its pulmonary, intestinal, and renal functions, it fixes glycogen and acts as an accumulator of poisons, and so resembles in its action the liver; therefore the organs of the fetus possess only a potential activity.
The secretion of the post-pituitary would now cause the change from the internal cell secretion to milk. But it is inhibited from so doing by the placenta. When the placenta is removed, after labor, the post-pituitary can act, and a free flow of milk is established.
Twins and triplets, being quite common, will not be considered here, although there are 2 cases of interest of the latter that deserve citation. Sperling reports 2 instances of triplets; in the first there was 1 placenta and chorion, 2 amnions, and the sex was the same; in the second case, in which the sexes were different, there were 3 placentas, 3 chorions, and 3 amnions.
Tarnier reports an instance of partus serotinus in which the product of conception was carried in the uterus forty days after term. The fetus was macerated but not putrid, and the placenta had undergone fatty degeneration. At a recent meeting of the Chicago Gynecological Society, Dr.
After the birth of the child the womb becomes smaller, its walls grow thicker, and the cavity within is narrowed. This series of changes partly detaches the placenta, but the separation depends chiefly upon the uterine contractions. These contractions also force the after- birth into the vagina, whence it may ultimately be dislodged by the patient if she bears down again.
We should all, at once, agree upon placing him among the mammalian vertebrates; and his lower jaw, his molars, and his brain, would leave no room for doubting the systematic position of the new genus among those mammals, whose young are nourished during gestation by means of a placenta, or what are called the 'placental mammals.
This latter portion, the veil that passes from the edge of the placenta, is formed of the two membranes we have mentioned, namely, the chorion and the amnion. The placenta is, for the most part, a highly developed portion of the chorionic membrane, which became specialized simply because it happened to receive the best supply of blood.
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