<prompt> Umbilical cord attached to the margin of placenta:Circumvallate placentaBattledore placentaVelamentous insertionVasa previa  <response>: Ans. b Battledore placentaRef. Williams Obstetrics 23rd ed. Ch: 27 Normally, the cord usually is inserted at or near the center of the fetal surface of the placenta. Cord insertion at the placental margin is sometimes referred to as a Battledore placenta. It is found in about 7 of term placentas. Velamentous insertion: This type of insertion is of considerable clinical importance. The umbilical vessels spread within the membranes at a distance from the placental margin, which they reach surrounded only by a fold of amnion. As a result, vessels are vulnerable to compression, which may lead to fetal anoxia. Incidence: 1 