Velamentous insertion of the umbilical cord

This video clip illustrates different types of umbilical cord insertion into the placenta at 11-13 weeks’ gestation. The insertion can be central (about 90%), eccentric, marginal or velamentous (about 1%). In the latter the cord inserts into the membranes before entering the placental disk and the vessels crossing the membranes are not mechanically protected by Wharton’s jelly or placental tissue. The condition is strongly associated with vasa previa (type one). Consequently, in every case of velamentous i