Sacrum, Anterior View

Description

Oriented anteriorly, the male sacrum presents its pelvic surface as a smooth concavity from the sacral promontory superiorly down to the apex where it articulates with the coccyx. Four paired anterior (pelvic) sacral foramina perforate the body and transmit the ventral rami of the sacral spinal nerves, aligned in two vertical rows lateral to the transverse ridges that mark fusion of the sacral vertebral bodies. Laterally, the broad alae flare toward the auricular surfaces that meet the ilia at the sacroiliac joints, while the median sacral crest and sacral hiatus remain posterior and out of view in this perspective. An anterior sacral view is the one you want when teaching the pelvic inlet and load transfer from the lumbar spine into the ring of the pelvis, because the promontory and alar margins define obstetric conjugates and are palpated or inferred on imaging for cephalopelvic assessment. The anterior foramina also matter in anterior approaches to the lumbosacral junction and sacral ala, where implants and retractors must respect the course of the lumbosacral trunk and the ventral sacral nerve roots. Small landmarks. Big consequences. Use this artwork for gross anatomy and pelvis modules, obstetrics and gynecology teaching on pelvic brim measurements, and spine or orthopedic texts discussing sacroiliac joint anatomy and anterior sacral corridors for fixation or tumor access. It also supports radiology correlation for AP pelvic radiographs and CT reconstructions where anterior sacral foramina and the promontory are key reference points. Anatomical accuracy verified by SciePro's Medical Advisory Board.