A textbook of obstetrics . d Leopold, loc. cit. 3 Diet, encyeloped, des Sc. med., art. Fetus. 4 Archiv f. Gyn., Bd. lvi, H. 1, p. 136. 5 Lehrbuch der Ges. (iynak., p. 552. 136 PJREGNANCY that he has never seen the slightest disadvantage to the fetus fromthis cause ; but the knots can be drawn so tight as to completelyshut oti the placental blood-supply, especially in the case oftwins in a single amniotic cavity, where one cord may be drawnin a tight knot about the other, obliterating the hitters blood-vessels. The gelatin of the cord is often displaced at the seat ofthe knot, so that when the
A textbook of obstetrics . d Leopold, loc. cit. 3 Diet, encyeloped, des Sc. med., art. Fetus. 4 Archiv f. Gyn., Bd. lvi, H. 1, p. 136. 5 Lehrbuch der Ges. (iynak., p. 552. 136 PJREGNANCY that he has never seen the slightest disadvantage to the fetus fromthis cause ; but the knots can be drawn so tight as to completelyshut oti the placental blood-supply, especially in the case oftwins in a single amniotic cavity, where one cord may be drawnin a tight knot about the other, obliterating the hitters blood-vessels. The gelatin of the cord is often displaced at the seat ofthe knot, so that when the latter is untied its situation is markedby deep depressions. False knots of the cord are localizedcollections of the mucous tissue in it. A loop of the cord mayadhere by its proximal edges, giving rise to a lateral projectionsuch as is shown in figure 102, in which there is a loop of thethree blood-vessels. Coiling of the Cord Around the Fetus.—Loops of the cordmay be wound about different portions of the fetal body. The. Fig. 102.—A false and a true knot in the cord (authors cases). neck may be encircled once or twice, more rarely from four tonine times (Braun), or loops maybe thrown around the encircled part may be so compressed that it is strangulatedand tlie distal portion is destroyed, but it is doubtful whether aconstricting cord can ever determine the amputation of a part ;for when it sinks through the soft tissues to the bones it thereexperiences a pressure greater than it itself can exert, and is,therefore, in its turn, destroyed (Braun). Thus the neck lias beensevered to the spinal column, and limbs have been cut throughto the bone, but there the process usually stops. Marginal and Velamentous Insertion of the Cord.—TheCOrd is usually inserted somewhere near the center of the pla-centa. As the insertion approaches the cl\^c of that organ, the THE UMBILICAL Co A/). 137 condition receives the name of marginal insertion, or battledoreplacenta. If the cord
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