**3. Abnormal course or connection of vessels**

The insertion of umbilical cord can be located following the chorionic plate vessels using color Doppler technique. The placental insertion of the UC is better observed by ultrasound in the first trimester. Later when gestational age increases, visualization becomes difficult, especially when the placenta is posterior. The evaluation of fetal circulation is done by examining the umbilical arteries. The umbilical vascular evaluation provides information on the circulation at the fetomaternal interface level, giving the possibility of early detection of risk to the fetus [19].
