Couinaud’s segments are used to divide which organ –
**Core Concept**
Couinaud's classification is a system used to divide the liver into functional segments based on the flow of blood from the hepatic artery and portal vein into the corresponding hepatic veins. This classification is essential in liver surgery, transplantation, and radiology.
**Why the Correct Answer is Right**
The liver is divided into eight Couinaud's segments, each receiving a specific blood supply from the hepatic artery and portal vein. The segments are further divided into sub-segments based on the branching of the portal vein and hepatic artery. This classification helps in identifying the specific segment of the liver involved in various liver diseases and injuries, making it crucial in surgical planning and postoperative management. The hepatic veins collect blood from these segments and drain it into the inferior vena cava.
**Why Each Wrong Option is Incorrect**
**Option A:** The liver is not divided into segments based on its surface anatomy or lobes.
**Option B:** The Segments of the liver are not defined by the location of the gallbladder.
**Option C:** The liver is not divided into segments based on the hepatic veins alone.
**Clinical Pearl / High-Yield Fact**
Couinaud's classification is a useful tool in liver surgery and radiology, helping to identify the specific segment of the liver involved in various liver diseases and injuries. This knowledge is essential in planning surgical interventions and postoperative management.
**Correct Answer:** C. The liver.