Which of the following is not true of placenta?
Ans. is'd'i.e., At term about four fifths of placenta of maternal origin PlacentaHuman placenta is discoid in shape.It has two surfaces, fetal and maternal.In the beginning the placenta growth is more rapid than that of the fetus, by 17th week they have equal weight.By term placental weight is one sixth of fetal weight.Maternal surface constitute 15-20 somewhat polygonal placental lobule, or cotyledon.Each lobule is supplied with a single truncal branch of chorionic aery.And each lobule has a single vein so that so that lobules constitute functional units of placental architecture.Placenta at termAt term it is almost circular disc with a diameter of 15-20 cm and thickness about 3 cm at center.lt's approximate weight is 500 gm.The ratio of placental: fetal weight is 1: 6 and occupies about 30% of uterine wall.At term, about four fifths of placenta is fetal in origin.
Number of cotyledons increases with gestational age
Weight of fetus and placenta equal at 4 months
After delivery weight ofplacenta is 500 gm
At term about four fifths of placenta of maternal origin