Coccyx
Coccyx , os coccygis, is a bone fused in an adult from 4-5, less often from 3-6 vertebrae.
The coccyx has the shape of a curved pyramid, the base of which is turned upward, and the tip is downward. The vertebrae that form it have only bodies. On the first coccygeal vertebrae, on each side, there are the remains of the upper articular processes in the form of small protrusions - the coccygeal horns, cornua coccygea, which point upwards and connect to the sacral horns.
The upper surface of the coccyx is somewhat concave, connected to the tip of the sacrum by means of the sacrococcygeal joint.
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