Lymph from above the upper horizontal watershed drains into which lymph nodes?

Lymph from above the upper horizontal watershed drains into which lymph nodes?

• A. Cervical
• B. Inguinal
• C. Axillary
• D. Popliteal

Answer: (A)

Lymphatic drainage follows regional basins, and watershed lines mark where lymph from a region tends to travel. The upper horizontal watershed runs across the body at roughly the level of the clavicles. Lymph from areas above this line collects in the cervical (neck) lymph nodes. So, lymph from above the watershed drains into cervical nodes because the regional drainage pathway leads toward that node group. (Below the line, drainage would go toward axillary or inguinal nodes depending on the exact location.)

Lymphatic drainage follows regional basins, and watershed lines mark where lymph from a region tends to travel. The upper horizontal watershed runs across the body at roughly the level of the clavicles. Lymph from areas above this line collects in the cervical (neck) lymph nodes. So, lymph from above the watershed drains into cervical nodes because the regional drainage pathway leads toward that node group. (Below the line, drainage would go toward axillary or inguinal nodes depending on the exact location.)