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Human Skeleton Anatomy Sacra Bone 3D Rendering. The Sacrum Situates At The Upper, Back Part Of The Pelvic Cavity, Between The Two Wings Of The Pelvis. It Forms Joints With Four Other Bones. The Two Projections At The Sides Of The Sacrum Are Called The Algae, And Articulate With The Ilium At The L-Shaped Sacroiliac Joints.