Superior gluteal veins
Encyclopedia
The Superior Gluteal Veins (gluteal veins) are venæ comitantes of the superior gluteal artery
Superior gluteal artery
The superior gluteal artery is the largest branch of the internal iliac artery, and appears to be the continuation of the posterior division of that vessel....

; they receive tributaries from the buttock corresponding with the branches of the artery, and enter the pelvis
Pelvis
In human anatomy, the pelvis is the lower part of the trunk, between the abdomen and the lower limbs .The pelvis includes several structures:...

 through the greater sciatic foramen
Greater sciatic foramen
-Boundaries:It is bounded as follows:* anterolaterally by the greater sciatic notch of the illium* posteromedially by the sacrotuberous ligament* inferiorly by the sacrospinous ligament and the ischial spine* superiorly by the anterior sacroilliac ligament...

, above the Piriformis, and frequently unite before ending in the hypogastric vein (internal iliac vein).
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