Ductus venosus


Ductus venosus
Vein: Ductus venosus
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Fetal circulation. The ductus venosus (red) connects the umbilical vein to the inferior vena cava.
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The liver and the veins in connection with it, of a human embryo, twenty-four or twenty-five days old, as seen from the ventral surface.
Gray's subject #139 540
Source umbilical vein
Drains to inferior vena cava
Artery ductus arteriosus

In the fetus, the ductus venosus shunts approximately half of the blood flow of the umbilical vein directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. In conjunction with the other fetal shunts, the foramen ovale and ductus arteriosus, it plays a critical role in preferentially shunting oxygenated blood to the fetal brain. It is a part of fetal circulation.

Contents

Postnatal closure

The ductus venosus is open at the time of the birth and is the reason why umbilical vein catheterization works. Ductus venosus naturally closes during the first week of life in most full-term neonates; however, it may take much longer to close in pre-term neonates. Functional closure occurs within minutes of birth. Structural closure in term babies occurs within 3 to 7 days.

After it closes, the remnant is known as ligamentum venosum.

If the ductus venosus fails to occlude after birth, the individual is said to have an intrahepatic portosystemic shunt (PSS). This condition is hereditary in some dog breeds (e.g. Irish Wolfhound). The ductus venosus shows a delayed closure in preterm infants, with no significant correlation to the closure of the ductus arteriosus or the condition of the infant.[1] Possibly, increased levels of dilating prostaglandins leads to a delayed occlusion of the vessel.[1]

See also

References

  1. ^ a b Fugelseth D, Lindemann R, Liestøl K, Kiserud T, Langslet A (December 1998). "Postnatal closure of ductus venosus in preterm infants ≤32 weeks. An ultrasonographic study". Early Hum. Dev. 53 (2): 163–9. PMID 10195709. 

External links


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Look at other dictionaries:

  • Ductus venosus — Der Ductus venosus (ARANTII) ist eine fetale Kurzschlussverbindung zwischen der Leberpfortader und der unteren Hohlvene (Vena cava inferior beim Menschen, bei Tieren als „hintere Hohlvene“, Vena cava caudalis, bezeichnet). Vor der Geburt wird das …   Deutsch Wikipedia

  • Ductus venosus — Canal d Arantius Le canal d Arantius ou ductus venosus est un vaisseau permettant le bon fonctionnement de la circulation fœtale. Fonctionnement Au sein du foetus, le canal d Arantius permet à la majeure partie du sang provenant de la veine… …   Wikipédia en Français

  • Ductus venosus — veninis latakas statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Ductus venosus ryšiai: platesnis terminas – vidinės embrioninės venos …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Ductus vènosus — veninis latakas statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Ductus vènosus ryšiai: platesnis terminas – bambos dalis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Ductus venosus — veninis latakas statusas T sritis embriologija atitikmenys: lot. Ductus venosus ryšiai: platesnis terminas – vidinės embrioninės venos siauresnis terminas – veninis raištis …   Medicininės histologijos ir embriologijos vardynas

  • ductus venosus — ductus ve·no·sus vi nō səs n a vein passing through the liver and connecting the left umbilical vein with the inferior vena cava of the fetus, losing its circulatory function after birth, and persisting as the ligamentum venosum of the liver * *… …   Medical dictionary

  • ductus venosus — və̇ˈnōsəs, vēˈ noun Etymology: New Latin, venous duct : a vein passing through the liver and connecting the left umbilical vein with the inferior vena cava of the fetus, losing its circulatory function after birth, and persisting as one of the… …   Useful english dictionary

  • Persitierender Ductus venosus — Ductus venosus Der Ductus venosus (ARANTII) ist eine fetale Kurzschlussverbindung zwischen der Leberpfortader und der unteren Hohlvene (Vena cava inferior beim Menschen, bei Tieren als „hintere Hohlvene“, Vena cava caudalis, bezeichnet). Vor der… …   Deutsch Wikipedia

  • fissure of ductus venosus — fossa ductus venosi …   Medical dictionary

  • venosus — see DUCTUS VENOSUS, SINUS VENOSUS, SINUS VENOSUS SCLERAE …   Medical dictionary


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