Which of the following areas would contain the fewest lymph nodes?

• A. Central nervous system
• B. Axillary region
• C. Cervical region
• D. Inguinal region

Answer: (A)

Verified step by step guidance

1. Understand the role of lymph nodes: Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. They filter lymph fluid and are involved in immune responses. They are distributed throughout the body, but their density varies by region.
2. Review the regions mentioned: The axillary region (armpits), cervical region (neck), and inguinal region (groin) are areas with high concentrations of lymph nodes. These regions are strategically located to filter lymph from major parts of the body.
3. Consider the central nervous system (CNS): The CNS, which includes the brain and spinal cord, is unique because it lacks a traditional lymphatic system. Instead, it relies on the recently discovered glymphatic system for waste clearance, which does not include lymph nodes.
4. Compare the regions: Since the CNS does not contain lymph nodes, it would have the fewest lymph nodes compared to the other regions listed, which are known to have clusters of lymph nodes.
5. Conclude based on the comparison: The central nervous system is the correct answer because it contains no lymph nodes, unlike the axillary, cervical, and inguinal regions.