The temporary structure between umbilical vein and inferior vena cava in the fetal circulation is known as :

Appeared in: IGNOU PB Bsc Nsg.Entrance-2026

Explanation

The ductus venosus is a temporary blood vessel unique to the fetal circulatory system.
It functions as a shunt, allowing a significant portion of oxygenated blood from the umbilical vein to bypass the fetal liver.
This shunted blood flows directly into the inferior vena cava, mixing with deoxygenated blood before entering the right atrium.
This mechanism ensures that the most highly oxygenated blood from the placenta is efficiently delivered to the fetal brain and heart.

Option A: The foramen ovale is an opening between the right and left atria, not a vessel connecting the umbilical vein and inferior vena cava.
Option B: The ductus arteriosus connects the pulmonary artery to the aorta.
Option C: The ligamentum venosum is the fibrous remnant of the ductus venosus after it closes postnatally. It is not the active, patent structure found in the fetus.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fetal circulation and anatomical shunts as background academic context rather than a clinical decision trigger.
Understanding fetal circulation is crucial for neonatal assessment, as the transition to postnatal circulation involves the closure of these shunts.
Failure of these shunts to close after birth can lead to congenital heart defects like a Patent Ductus Arteriosus (PDA) or Patent Foramen Ovale (PFO), which may require medical or surgical intervention.
What if? If the ductus venosus fails to close after birth (a rare condition called patent ductus venosus), it can cause serious complications like hepatic dysfunction and hyperammonemia because portal blood bypasses the liver's essential filtering process.

How to Approach the Question

First, identify the key anatomical structures mentioned in the question: 'umbilical vein' and 'inferior vena cava' in the context of 'fetal circulation'.
The question asks for the 'temporary structure' that connects these two vessels.
Recall the three primary shunts in fetal circulation: ductus venosus, foramen ovale, and ductus arteriosus.
Mentally map the location and function of each shunt: The ductus venosus bypasses the liver, the foramen ovale bypasses the lungs (atria-level), and the ductus arteriosus bypasses the lungs (great-vessel-level).
Based on this, identify the ductus venosus as the structure that connects the umbilical vein to the inferior vena cava.
Differentiate between the active fetal structure (ductus venosus) and its postnatal remnant (ligamentum venosum) to eliminate the incorrect option.

Concept Tested & Keywords

Concept Tested: Fetal circulation and anatomical shunts.
Stem keywords: fetal circulation, umbilical vein, inferior vena cava, temporary structure
Lead-in keywords: known as
Negative lead-in flag: false

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E6 Anatomy Grays 43e Vol 1 Part 2 pp. 56-58, 59-61

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