Sacrum sacrovertebral angle, an angle of 30 degrees from the horizontal plane that provides a useful marker for a sling implant procedure. The pelvic surface of the sacrum is concave from the top, and curved slightly from side to side. Its middle part is crossed by four transverse ridges, which correspond to the original planes of separation between the five sacral vertebrae. The body of the first segment is large and has the form of a lumbar vertebra; the bodies of the next bones get progressively smaller, are flattened from the back, and curved to shape themselves to the sacrum, being
The Singing Bone learns of the younger brother's adventure. They then set out to deliver the body to the king, but on passing a bridge, the older kills the younger and buries his body beneath it. He takes the boar himself to the king and marries the king's daughter as prize. One day a shepherd sees a bone under the bridge and uses it to make a mouthpiece for a horn, which sings of the brother's fate: "Ah! Dear shepherd, you are blowing your horn With one of my bones, which night and morn Lie still unburied, beneath the wave Where I was