part of part of Homo sapiens fused sacrum bone foramen anterior sacral foramina of sacrum 2026-03-19T00:00:00Z A bone foramen located on the pelvic (anterior) surface of the sacrum; one of four pairs of openings arranged in two vertical rows that transmit the ventral rami of the upper four sacral spinal nerves and accompanying blood vessels into the pelvic cavity. David Osumi-Sutherland