True about umbilical cord-
Ans. is 'c' i.e., Right umbilical vein disappears Umbilical cordo Umbilical cord develops from connecting stalk, which extends from the caudal end of the embryo to the chorion. Umbilical cord is covered by amniotic epithelium and contains a core of mesenchyme known as whartan's jelly.o Contents of umbilical cord are : (i) Wharton fsjelly, (ii) Two umbilical arteries, (iii) One (left) umbilical vein, (iv) Remnant of yolk sac, and (v) Remnant of allanto-enteric diverticulum. Initially 2 umbilical arteries and 2 umbilical veins develop in mesoderm, but right umbilical vein disappears. Left umbilical vein persists along with 2 umbilical arteries.o At full term, the umbilical cord measures 1 -2cm in diameter, and 50-55cm in length and generally attached to the center of fetal surface of placenta.
Cantains two umbilical veins
Cantains one umbilical artery
Right umbilical vein disappears
Length is 25-30 cm.
Placenta, Fetal Membranes, Birth Defects, and Twinning