Anterior Trunk of Internal Iliac Vein
Truncus anterior venae iliacae internae
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The majority of the veins in the pelvis follow the path of the arteries with the exception of the iliolumbar vein and the umbilical vein. The anterior trunk of the internal iliac vein drains a large portion of the pelvis region including many of the plexi surrounding the pelvic viscera.
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Internal Iliac Artery
The internal iliac artery (IIA) is a branch of common iliac artery, and it divides into the anterior and posterior divisions.