Lateral sacral veins
Encyclopedia
The lateral sacral veins accompany the lateral sacral arteries on the anterior surface of the sacrum
and end in the hypogastric vein.
Sacrum
In vertebrate anatomy the sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx...
and end in the hypogastric vein.