External genitalia drain into the inguinal lymph nodes, and the internal reproductive organs drain into the pelvic lymph nodes.

• A. External genitalia drain into pelvic nodes
• B. True
• C. Internal reproductive organs drain into inguinal nodes
• D. False

Answer: (B)

The main concept is how lymph flows from different parts of the reproductive region. External genitalia, such as the scrotum, penis, and vulva, drain primarily into the superficial inguinal lymph nodes. From there, the drainage can continue to deeper pelvic nodes as needed. Internal reproductive organs, like the uterus, cervix, and proximal vagina, drain into pelvic lymph nodes, mainly the internal iliac nodes (with some contribution to other pelvic nodes). This separation helps explain patterns of lymphatic spread and guides lymph drainage techniques in therapy.

There are nuances to keep in mind: the ovaries and testes, though considered internal gonads, typically drain to para-aortic (lumbar) nodes rather than pelvic nodes. The vagina has portions that drain to superficial inguinal nodes as well, particularly the distal portion. But when we refer to internal reproductive organs such as the uterus and cervix, their drainage to pelvic nodes is the standard pattern.