Sacrum
The sacrum is a Os odd, median and symmetrical, formed in fact of the welding of the 5 crowned Vertèbre S (or sacral). It has a pyramidal form at base crâniale, bases called the crowned headland, the point of the pyramid being called the apex. It is located between the 2 bones iliaques to form the osseous basin.
At the woman, the sacrum is broader than at the man.
Former face
Also called pelvic, it is concave and looks at downwards. On this face, one notes the fusion of the vertebral bodies, fusion visible with the level of the transverse lines. The Processus costiforme S are bulky, one notices also the fusion of the Zygapophyse S. the yellow Ligament also will take part in fusion, while leaving 8 openings which are the dorsal crowned foramens or crowned holes former
Posterior face
It under cutaneous and is divided in the length by the crowned peak. This peak is formed by the meeting of the thorny processes of the crowned vertebrae, and which ends in bottom, with a notch: the crowned foramen.
Dug in the thickness of the bone, the crowned foramen finishes the rachidian foramen. He traverses the sacrum base with summon.
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