A nurse's handbook of obstetrics, for use in training-schools . ygenated by passingthrough the lungs in vessels that lie closely in contact with theair-spaces. This process, by which waste products and oxygencan pass from fetal to maternal blood, and vice versa, throughthe walls of the vessels without any actual mingling of the bloodcurrents, is called osmosis. The placenta and fcetus are connected by means of the funis,or umbilical cord, usually about twenty inches in length and thesize of the forefinger. It leaves the placenta at about its centreand enters the abdominal wall of the fcetus at
A nurse's handbook of obstetrics, for use in training-schools . ygenated by passingthrough the lungs in vessels that lie closely in contact with theair-spaces. This process, by which waste products and oxygencan pass from fetal to maternal blood, and vice versa, throughthe walls of the vessels without any actual mingling of the bloodcurrents, is called osmosis. The placenta and fcetus are connected by means of the funis,or umbilical cord, usually about twenty inches in length and thesize of the forefinger. It leaves the placenta at about its centreand enters the abdominal wall of the fcetus at a point called theumbilicus, or navel, a trifle below the middle of the medianline in front. The placenta is formed during the second month of gesta-tion, but is not fully developed until the third month, after whichit steadily increases in size as pregnancy advances. The umbilical cord is formed about the fourth week, and,like the placenta, increases in size with the advancement ofpregnancy. It is made up of two arteries and one large vein, THE PLACENTA. 49. Fig. 2i.—Fetal surface of the placenta. (Garrigues.) The filmy membrane about thecircumference is the ruptured amniotic sac.
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