Which set lists the four primary groups of pelvic lymph nodes?

Which set lists the four primary groups of pelvic lymph nodes?

• A. External iliac; Internal iliac; Sacral; Common iliac
• B. External iliac; Internal iliac
• C. Sacral; Common iliac
• D. External iliac; Sacral

Answer: (A)

Pelvic lymphatic drainage is organized into four principal nodal basins that run with the main arteries: external iliac, internal iliac, sacral, and common iliac. External iliac nodes lie along the external iliac artery and drain structures near the pelvic brim and lower limb via the inguinal route. Internal iliac nodes lie along the internal iliac artery and receive drainage from most pelvic viscera and the perineum. Sacral (presacral) nodes lie along the sacrum and drain posterior pelvic structures, including portions of the rectum and pelvic organs. Common iliac nodes sit at the bifurcation of the common iliac artery and collect lymph from the external and internal iliac basins, funneling toward the lumbar nodes. Since the four groups together cover all the major pelvic drainage pathways, this set is the complete list. Other options omit one or more of these key basins.

Pelvic lymphatic drainage is organized into four principal nodal basins that run with the main arteries: external iliac, internal iliac, sacral, and common iliac. External iliac nodes lie along the external iliac artery and drain structures near the pelvic brim and lower limb via the inguinal route. Internal iliac nodes lie along the internal iliac artery and receive drainage from most pelvic viscera and the perineum. Sacral (presacral) nodes lie along the sacrum and drain posterior pelvic structures, including portions of the rectum and pelvic organs. Common iliac nodes sit at the bifurcation of the common iliac artery and collect lymph from the external and internal iliac basins, funneling toward the lumbar nodes. Since the four groups together cover all the major pelvic drainage pathways, this set is the complete list. Other options omit one or more of these key basins.