Umbilical cord from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo. The cord is not directly connected to the mother's circulatory system, but instead joins the placenta, which transfers materials to and from the maternal blood without allowing direct mixing. The length of the umbilical cord is approximately equal to the crown-rump length of the fetus throughout pregnancy. The umbilical cord in a full term neonate is usually about 50 centimeters (20 in) long and about 2 centimeters (0.75 in) in
Abortion in the Republic of Ireland foetus suffering from anencephaly (the absence of a major portion of the brain, skull, and scalp; blind, deaf, unconscious, and unable to feel pain, a disorder which is universally fatal), was prevented from travelling to Britain by the Health Service Executive. The High Court ruled on 9 May 2007 that she could not lawfully be prevented from travelling even though she was a ward of the state. Amanda Mellet became pregnant in 2011; however, the foetus was suffering from Edwards syndrome, a fatal condition. She was unable to have an abortion in Ireland and had to travel to the UK.