Which structure is a landmark of the left intersegmental fissure and is a remnant of the fetal umbilical vein?

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The key idea is that the liver retains a fibrous remnant from fetal circulation that serves as an important anatomical landmark. The ligamentum teres hepatis is the fibrous cord formed from the obliterated fetal umbilical vein. In life this vein carried oxygenated blood from the placenta to the liver, but after birth it closes and becomes a solid, avascular cord lying in the fissure that marks the left intersegmental plane on the liver's visceral surface. This makes it a classic landmark for orientation within the left side of the liver.

The other options don’t fit this combination. The falciform ligament is the peritoneal fold in which the ligamentum teres resides, not its remnant itself. The left hepatic vein is a vein draining the liver into the inferior vena cava, not a fetal remnant. The term “ascending left portal vein” isn’t a standard anatomical remnant related to the fetal circulation.