Which of the following structures passes through the deep inguinal ring but does NOT pass through the superficial inguinal ring?

Explanation

## Structures Passing Through the Inguinal Canal **Key Point:** The ilioinguinal nerve does NOT pass through either the deep or superficial inguinal rings. It enters the inguinal canal by piercing the internal oblique muscle lateral to the internal ring and exits by piercing the external oblique aponeurosis above the superficial ring. ### Comparison of Structures and Their Paths | Structure | Deep Ring | Superficial Ring | Path | | --- | --- | --- | --- | | **Spermatic cord** | ✓ Passes through | ✓ Passes through | Enters at deep ring, exits at superficial ring | | **Genital branch of genitofemoral nerve** | ✓ Passes through | ✓ Passes through | Travels within spermatic cord | | **Cremasteric artery** | ✓ Passes through | ✓ Passes through | Branch of inferior epigastric artery, travels in spermatic cord | | **Ilioinguinal nerve** | ✗ Does NOT pass | ✗ Does NOT pass | Enters canal by piercing internal oblique, exits above superficial ring | **High-Yield:** The ilioinguinal nerve is an important anatomical landmark during inguinal hernia repair. It must be identified and preserved to avoid postoperative groin pain and numbness of the scrotum/labium majus. **Mnemonic — Contents of Spermatic Cord (3 A's, 3 V's, 3 N's):** - **3 Arteries:** Testicular artery, artery to vas deferens, cremasteric artery - **3 Veins:** Testicular vein (pampiniform plexus), cremasteric vein, artery to vas deferens vein - **3 Nerves:** Genital branch of genitofemoral nerve, sympathetic fibres, parasympathetic fibres **Clinical Pearl:** During open inguinal hernia repair, the ilioinguinal nerve runs superficially in the surgical field and is at risk of injury if not carefully identified. Injury causes chronic groin pain and sensory loss in the external genitalia and medial thigh. ### Why This Question Matters Understanding which structures pass through the rings is essential for: - Identifying anatomical boundaries during surgery - Understanding the path of indirect inguinal hernia (follows spermatic cord through both rings) - Recognizing why the ilioinguinal nerve is vulnerable during repair [cite:Standring Anatomy 41e Ch 69]