A textbook of obstetrics . s 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 should first enter the membranes at somelittle distance from the placenta, to and from which the vessels,unprotected and more or less separated from one another, pursuetheir course between the amnion and chorion, a condition knownas insertio velamentosa exists. The explanation of such an oc-currence is obv
A textbook of obstetrics . s 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 should first enter the membranes at somelittle distance from the placenta, to and from which the vessels,unprotected and more or less separated from one another, pursuetheir course between the amnion and chorion, a condition knownas insertio velamentosa exists. The explanation of such an oc-currence is obvious : The allantois is conveyed at first indiffer-ently to any portion of the periphery of the ovum, but as theplacenta begins to be differentiated the embryo, by a movementof rotation, enables the umbilical vessels to pursue a straightcourse toward their insertion in the placenta. Should the rota-tion of the fetus be in any way interfered with, or should thenewlv-formed umbilical cord contract adhesions with the amnion. Fig. 103.—Entanglement ofcords in twins (Winckel).
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