QuestionSBA
QuestionChoice
This is the correct answer. The umbilical cord contains 2 umbilical arteries and 1 umbilical vein, where the latter carries oxygenated blood from the placenta to the fetus. The physiological remnant of this structure is the ligamentum teres (also known as the round ligament) which is a fibrous cord that runs from the umbilicus to the left lobe of the liver in the free border of the falciform ligament.
10027346
a
Umbilical vein
QuestionChoice
This is not the correct answer. The allantois is a canal within the umbilical cord that drains urine from the bladder of the fetus. The physiological remnant of the allantois is a fibrous structure known as the urachus, which then definitively forms the median umbilical ligament later on.
10027348
c
Allantois
QuestionChoice
This is not the correct answer. The ductus arteriosus is a blood vessel connecting the proximal descending aorta to the trunk of the pulmonary artery in the developing fetus. This allows the majority of the blood from the right ventricle to bypass the fetus's fluid-filled and non-functioning lungs. The physiological remnant of this structure, which is formed within three weeks post-birth, is the ligamentum arteriosum.
10027349
d
Ductus arteriosus
QuestionChoice
This is not the correct answer. In the developing fetus, the ductus venosus is a shunt that allows some of the oxygenated blood from the umbilical vein to bypass the liver and directly flow into the inferior vena cava. The ductus venosus, ductus arteriosus and, foramen ovale contribute to the essential role of shunting oxygenated blood preferentially to the fetal brain. The physiological remnant of this structure, a fibrous structure that may be continuous with the ligamentum teres, is the ligamentum venosum.
10027350
e
Ductus venosus
QuestionChoice
This is not the correct answer. The umbilical cord contains 2 umbilical arteries and 1 umbilical vein, where the former carries deoxygenated blood from the fetus to the placenta. The physiological remnants of the umbilical arteries are the round ligaments of the bladder.
10027347
b
Umbilical artery
Concept
Chapter
2693
5973
Development of foetal circulation
Topic
171
Embryology
17867
The ligamentum teres is a physiological remnant of which embryological feature?
a