Until the end of the 16th week, the placenta grows. At term, ratio of weight of fetus to weight of placenta is:: (A) 3:01, (B) 4:01, (C) 6:01, (D) 8:01
Answer is C. Placenta at term is a circular disc with diameter 15-20 cm and thickness of 2.5 cm. Its weight is 500 gm. The propoion of weight of the fetus to the weight of the placenta is roughly 6:1 at term and occupies about 30% of the uterine wall. At term, about four-fifths of the placenta is of fetal origin. Ref: Textbook of Obstetrics by D C Dutta, 6th edition, Page 29.