Hesselbach's triangle is bounded by three structures. Which of the following is NOT a boundary of Hesselbach's triangle?

Explanation

## Hesselbach's Triangle: Anatomical Boundaries **Key Point:** Hesselbach's triangle (also called the inguinal triangle) is a triangular area on the posterior wall of the inguinal canal bounded by three structures: | Boundary | Anatomical Structure | |----------|---------------------| | **Medial** | Lateral border of rectus abdominis (linea semilunaris) | | **Lateral** | Inferior epigastric vessels | | **Inferior** | Inguinal ligament | ### Clinical Significance **High-Yield:** Direct inguinal hernias protrude through Hesselbach's triangle, making them medial to the inferior epigastric vessels. This distinguishes them from indirect inguinal hernias, which pass lateral to these vessels through the deep inguinal ring. **Mnemonic:** **RIL** = **R**ectus (medial), **I**nferior epigastric (lateral), **L**igament (inferior). ### Why the Spermatic Cord is Not a Boundary The spermatic cord passes *through* the inguinal canal but does not form a structural boundary of Hesselbach's triangle. The cord lies anterior and medial to the triangle and is not part of its geometric definition. [cite:Standring Anatomy 42e Ch 76]