Fig. 1.

Fetal uterine position model. Uterine position was determined by assigning the first position to the implantation closest to the ovary and counting implantations in ascending order to the cervical end of the uterine horn. Both resorbed and viable fetuses were assigned position numbers. This was repeated independently on each uterine horn, and dry weight values were averaged when applicable to yield a mean weight for each position in the uterus. Resorptions at the implantation site were not included in the mean weight analysis.