<prompt> Nitabuchslayer is absent isPlacenta accretePlacenta prePlacenta membranaciaCircumvallate placenta  <response>: Ans is a i.e., Placenta accreteNitabuchs layerDuring formation of placenta, there is an area of fibrinoid degeneration where trophoblast cells covered with syncytium meet the decidua. This zone is known as Nitabuchs layer. This layer limits fuher invasion of the decidua by the trophoblast. Note: This membrane is absent in placenta accreta. 