Sacrum bodies are seen to be united at their circumferences by bone, wide intervals being left centrally, which, in the fresh state, are filled by the intervertebral discs. The dorsal surface of the sacrum is convex and narrower than the pelvic surface. In the middle line is the median sacral crest, surmounted by three or four tubercles—the rudimentary spinous processes of the upper three or four sacral vertebrae. On either side of the median sacral crest is a shallow sacral groove, which gives origin to the multifidus muscle. The floor of the groove is formed by the united laminae of the
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