• Is bounded medially by the linea semilunaris (lateral edge of the rectus abdominis), laterally by the inferior epigastric vessels, and interiorly by the inguinal ligament.
• Is an area of potential weakness and hence is a common site of a direct inguinal hernia.

Superficial inguinal ring

• Is a triangular opening in the aponeurosis of the external oblique muscle that lies just lateral to the pubic tubercle.

Deep inguinal ring

• Lies in the transversalis fascia, just lateral to the inferior epigastric vessels.

Inguinal canal

• Begins at the deep inguinal ring and terminates at the superficial ring.
• Transmits the spermatic cord or the round ligament of the uterus and the genital branch of the genitofemoral nerve, both of which also run through the deep inguinal ring and the inguinal canal. An indirect inguinal hernia (if present) also passes through this canal. Although the ilioinguinal nerve runs through part of the inguinal canal and the superficial inguinal ring, it does not pass through the deep inguinal ring.
• Anterior wall : aponeuroses of the external oblique and internal oblique muscles.
• Posterior wall : aponeurosis of the transverse abdominal muscle and transversalis fascia.
• Superior wall (roof) : arching fibers of the internal oblique and transverse muscles.
• Inferior wall (floor) : inguinal and lacunar ligaments.