A surgeon excises a poion of the liver to the left to the attachment of the falciform ligament. The segments that have been resected are
**Core Concept**
The liver is divided into eight segments based on the Couinaud classification, each supplied by its own portal vein branches and hepatic artery. The falciform ligament attaches to the left medial segment of the liver, marking the boundary between segments II and III.
**Why the Correct Answer is Right**
The segments of the liver are defined by their vascular supply and the location of the portal vein branches and hepatic artery. Segment II is located to the left of the falciform ligament and is supplied by the left branch of the portal vein. Segment III is located to the right of the falciform ligament and is supplied by the right branch of the portal vein. The surgeon has resected the left medial segment of the liver, which includes segments II and III.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not accurately describe the segments of the liver left to the falciform ligament.
* **Option B:** This option is incorrect as it does not accurately describe the segments of the liver left to the falciform ligament.
* **Option D:** This option is incorrect as it does not accurately describe the segments of the liver left to the falciform ligament.
**Clinical Pearl / High-Yield Fact**
The falciform ligament marks the boundary between segments II and III of the liver, and its location is important for surgeons to understand when performing liver resections.
**Correct Answer:** C. Segments II and III.