Abstract
The morphometry of the placental vessels was studied on a number of 51 normal term placentas, using plastic injection (Technovit 7143), followed by sodium hydroxide corrosion. In 51 cases, we found the diameter of the umbilical vein between 6.2-10.5 mm, most commonly, in 54.90% of cases, finding it between 8.0-8.6 mm. The trunk of the umbilical vein arised from a number of 2-4 branches, most commonly, in 41.18% of cases, being made of 2 branches. We observed the umbilical arteries on a number of 42 cases. The diameter of the umbilical artery 1, was between 2.5-6.0 mm, most frequently, in 45.24% of cases, having a diameter between 4.0-4.9 mm. The ratio between the diameter of the umbilical artery 1 and the diameter of the corresponding venous trunk was most commonly between 50.0-58.82%. The diameter of the umbilical artery 2, was between 3.0-8.5 mm, most frequently, in 53.66% of cases, having a diameter between 4.0-4.8 mm. The ratio between the diameter of the umbilical artery 2 and the diameter of the corresponding venous trunk, was most commonly between 40.0-46.51%, in one case, the diameter of the umbilical artery 2 was equal to the diameter of the venous trunk. Comparing the diameters of the two umbilical arteries on 41 placentas, we found in 56.10% of cases, the diameter of the umbilical artery 2 was larger then the diameter of the umbilical artery 1 by 0.2-2.5 mm and in 39.02% of cases, the diameter of the umbilical artery 1 was larger then the diameter of the umbilical artery 2 by 0.1-0.9 mm. In 8.20% of cases the umbilical arteries had the same diameter.
Highlights
Placental vessels are represented by the two umbilical arteries and the umbilical vein, which provides fetalplacental circulation
We studied the umbilical arteries on a number of 42 cases and because they were not always located to the right and left of the venous trunk, we named them the umbilical artery 1 and the umbilical artery 2
The umbilical artery 2 was observed in a number of 41 cases, because in one case we encountered a single umbilical artery, located to the right of the venous trunk
Summary
PETRU BORDEI1, LOREDANA STEFANIA SURDU1*, LUCIAN SERBANESCU1, IOAN SORIN TUDORACHE2. The morphometry of the placental vessels was studied on a number of 51 normal term placentas, using plastic injection (Technovit 7143), followed by sodium hydroxide corrosion. In its assembly, when the placenta is constituted, the blood lakes contain about 150 ml of blood, which is renewed 3-4 times/ minute This blood comes in contact with the chorionic villi, whose total surface reaches between 4-14 m2. It should be noted that placental exchanges do not take place at the level of all villosities, but only at the level of those at which the fetal vessels are in close contact with the syncytial membrane that covers them. In these last villi, the syncytium frequently presents a brush border[4, 5, 8]
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