A treatise on the science and practice of midwifery . to constrictions by the umbilical cord, but this accident is moreprobably produced by filamentous adnexaof the amnion. Knots in the cord are notuncommon, and they result from the foetus,in its movements, passing through a loopof the cord (Fig. 92). If there is an aver-age amount of Whartons jelly in the cord,the vessels are protected from pressure, and Fig no bad effects follow, tiery, in a recentpaper on this subject,2 attempts to showthat such knots are more important thanis generally believed, and relates two casesin which he believes th
A treatise on the science and practice of midwifery . to constrictions by the umbilical cord, but this accident is moreprobably produced by filamentous adnexaof the amnion. Knots in the cord are notuncommon, and they result from the foetus,in its movements, passing through a loopof the cord (Fig. 92). If there is an aver-age amount of Whartons jelly in the cord,the vessels are protected from pressure, and Fig no bad effects follow, tiery, in a recentpaper on this subject,2 attempts to showthat such knots are more important thanis generally believed, and relates two casesin which he believes them to have causedthe death of the foetus. Extreme torsion of the cord, an exagge-ration of the spiral twists generally observed,may prove injurious, and even fatal, to thechild, by obstructing the circulation in thevessels. Spaeth mentions three cases inwhich this caused the death of the foetus,the cord being twisted until it was reducedto the thickness of a thread. Anomalies in the distribution of the ves-sels of the cord are of common Knots of tin- finl The cord may be attached 1 American Journal of Obstetrics, vol. ii. p. 535. E Union medicate, Oct., 1876. 236 PREGNANCY. to the edge, instead of to the centre, of the placenta (battledore placenta).It may break up into its component parts before reaching the placenta,the vessels running through the membranes; and if, in such a case,traction on the cord be made, the separate vessels may lacerate and thecord become detached. There may be two veins and one artery, or onlyone vein and one artery, or there may be two separate cords to one pla-centa. These and other anomalies that might be mentioned are of littlepractical importance. Pathology of the Amnion.—The principal pathological condition ofthe amnion with which we are acquainted is that which is associatedwith excessive secretion of the liquor amnii, and is generally knownunder the name of hydramnios, which term Kidd1 limits to cases inwhich more than two quart
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
