Which of the following structures forms the anterior boundary of Calot's triangle?

Explanation

## Anatomy of Calot's Triangle **Key Point:** Calot's triangle (also called hepatocystic triangle) is a critical anatomical landmark bounded by three structures. ### Boundaries of Calot's Triangle | Boundary | Structure | | --- | --- | | **Medial (posterior)** | Common hepatic duct | | **Anterior (lateral)** | Cystic duct | | **Superior** | Right hepatic artery | **High-Yield:** The cystic duct forms the **anterior/lateral boundary** of Calot's triangle. This is the most commonly tested boundary in NEET PG. ### Clinical Significance **Clinical Pearl:** During cholecystectomy, the surgeon must clearly identify all three boundaries of Calot's triangle before dividing any structures. The triangle contains the right hepatic artery and cystic artery branches, which must be carefully dissected to avoid vascular injury. **Mnemonic:** **CHD** = **C**ystic duct (anterior), **H**epatic artery (superior), **D**uct (common hepatic, medial) ### Why This Matters Misidentification of the cystic duct boundary can lead to: - Bile duct injury - Vascular injury to the right hepatic artery - Incomplete dissection of the hepatocystic triangle [cite:Standring Anatomy 42e Ch 63]