Ligamentum Venosum

[Moon10]

We know that the ligamentum venosum is the fibrous remnant of the ductus venosus. But why is it located on the external surface of the liver? I mean, the ductus venosus is inside the liver parenchyma, so I don't understand why its remnant can be seen externally. Can you help me?

[StringJunky]

Do you know it's a foetal remnant and not an evolutionary one?

Quote

The ligamentum venosum is the fibrous remnant of the ductus venosus* of the fetal circulation. Usually, it is attached to the left branch of the portal vein within the porta hepatis. It may be continuous with the round ligament of liver.   https://en.wikipedia.org/wiki/Ligamentum_venosum

* In the fetus, the ductus venosus (Arantius' duct after Julius Caesar Aranzi[1]) shunts a portion of the left umbilical vein blood flow directly to the inferior vena cava.[2] Thus, it allows oxygenated blood from the placenta to bypass the liver.  https://en.wikipedia.org/wiki/Ductus_venosus

 

 

Does that help?

[Moon10]

Yes, but in the foetus the ductus venosus is inside the liver, so when it obliterates it should remain inside the organ.

 

[StringJunky]

14 hours ago, Moon10 said:

Yes, but in the foetus the ductus venosus is inside the liver, so when it obliterates it should remain inside the organ.

 

I don't know the answer to that.