Question
Which is true regarding structure marked with arrow
A. Two arteries
B. Umblical cord pulsation rate corresponds to maternal pulsation rate
C. Covered by amnion and chorion
D. Two veins
Show Answer
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Correct Answer » A
Explanation
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Ans:A. 2 arteries.
Structure is umblical cord, it has 2 arteries and one vein.
Umbilical cord
- 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 Wharton’s jelly.
- Contents of umbilical cord are : (i) Wharton’s jelly, (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.
- 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.
