The hydropathic encyclopedia: a system of hydropathy and hygiene .. . di-Hmeter of the placenta is usuallyabout six inches, and its thick-ness an inch and a half. placenta and cord. Physiologists do not agree whether the vessels of the placenta teriBmate in or communicate with those on the uterus; or whether, in itsutenae portions, there are intermediate cells in which the arteriesterniijate, and from which the veins commence. Nor do theyagree whether any portion of the blood of the foetus actually circu-lates tr-ough the heart, lungs, etc., of the mother. From all the in-vestigations which ha
The hydropathic encyclopedia: a system of hydropathy and hygiene .. . di-Hmeter of the placenta is usuallyabout six inches, and its thick-ness an inch and a half. placenta and cord. Physiologists do not agree whether the vessels of the placenta teriBmate in or communicate with those on the uterus; or whether, in itsutenae portions, there are intermediate cells in which the arteriesterniijate, and from which the veins commence. Nor do theyagree whether any portion of the blood of the foetus actually circu-lates tr-ough the heart, lungs, etc., of the mother. From all the in-vestigations which have been made, my own conclusion is, that theplacenta serves, in part, to purify the blood ; and that the blood of )otbmother and foetus mingles, to some extent, in the placenta, in conse-quence of the placental vessels extending into the uterine sinuses: andihat, further, while the blood of mother and foeti s act and react uponeach other in the substance of the placenta, in a manner analagous tothe action between water and blocd, in the bronchial vessels of aquatw. 162 MIDWIFEK7 animals, some portion of the blood of the foetus does actually go diaround of the mothers circulation. The Umbilical Cord.—The funis, cord, or navel-string forms theconnection between the placenta and child. It is composed of two ar-teries and a vein, and, like the placenta, is insensible. The arteriesvind spirally around the vein from right to left, forming in their course* number of loops or knots. The length of the cord varies greatlyits average is eighteen or twenty inches. The pulsation of the cord,which is usually strong and distinct, ceases in ten, fifteen, or twentyminutes after birth, and the portion attached to the child shrinks andfaUs off in five or six days. The Liquor Ammi.—This term is applied to the fluid which col-lects in the cavity of the amnion; it is secreted by the iuternal surfaceof this membrane, and its quantity varies from a pint to several quarts ;the average is from one t
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