Variations on Cord Insertion (Marginal, Membranous, Furcate)

D efinition — Marginal cord insertion is defined as insertion within 2 cm of the periphery of the disk. With a membranous (velamentous) cord insertion, the cord vessels insert into the placental disk within the membranes, in the absence of Wharton's jelly. Furcate cord insertion appears as a forklike division of the cord prior to insertion into the placental disk.