Umbilical cord is used in place of a bone marrow transplant in the treatment of blood disorders such as leukemia, with donations released for transplant through one registry, Netcord.org, passing 1,000,000 as of January 2013. Cord blood is used when the patient cannot find a matching bone marrow donor; this "extension" of the donor pool has driven the expansion of public banks. The umbilical cord in some mammals, including cows and sheep, contains two distinct umbilical veins. There is only one umbilical vein in the human umbilical cord. In some animals, the mother will gnaw through the cord, thus separating the placenta
Social uterus Social uterus Social uterus is a developmental concept in family therapy for psychosomatic disorders. Social uterus as an integrative model of family development was invented by Vladislav Chvála and Ludmila Trapková in 1990's. The metaphor of a social uterus was formed by comparing the biological function of the uterus and the maturation of the foetus inside it from conception to childbirth with the changes in the family from the birth of the child up to its separation around the age of 18. The metaphor translates facts well known from the biology of reproduction to the social level. In the "social