The lymphatics of the testis drain to which lymph node group, and why is this clinically important?
- A Para-aortic (lumbar) lymph nodes at L1-L2 level, because the testis developed in the retroperitoneum and descended with its lymphatics ✓
- B Inguinal lymph nodes, because the testis is in the scrotum
- C Iliac lymph nodes, following the testicular artery
- D Femoral lymph nodes in the femoral triangle
Correct answer: A. Para-aortic (lumbar) lymph nodes at L1-L2 level, because the testis developed in the retroperitoneum and descended with its lymphatics
Explanation
The testis develops from the gonadal ridge at L1-L2 and descends into the scrotum, carrying its vascular supply (testicular artery from aorta at L2) and lymphatic drainage with it. Testicular lymphatics drain to para-aortic (lumbar) nodes at L1-L2, NOT to inguinal nodes. This is clinically critical: testicular cancer spreads to para-aortic nodes first, and inguinal involvement occurs only if tumor invades the scrotal skin. By contrast, scrotal skin lymphatics drain to the inguinal nodes.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
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