The normal umbilical cord is coiled with the umbilical arteries twisting around the umbilical vein in a spiral manner. This color Doppler video clip demonstrates just that:
This was a 23 week old pregnancy. The placenta is anteriorly located with the cord suspended well within the abundant amniotic fluid.
See more details of this case at:
http://www.ultrasound-images.com/umbilical-cord.htm#Normal_coiling_of_the_umbilical_cord
See more details of this case at:
http://www.ultrasound-images.com/umbilical-cord.htm#Normal_coiling_of_the_umbilical_cord
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