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Coccyx
The coccyx (tailbone) is the final region of the spine, after the
sacrum.
This region is the evolutionary remains of what used to be a tail. The tailbone consists of 3 to 5 fused
vertebrae
with 4 being average. These vertebrae do not have individual names. The vertebrae may be fused as one solid piece of bone or in segments of 2 or more bones each. The tailbone is joined to the sacrum by the vestigial disc and ligaments.

The tailbone has only a limited ability to move independently of the sacrum. The exception to this general rule occurs when a woman is
pregnant.
In this case, the coccyx is able to move quite freely to allow an easier passage for childbirth. In women, the tailbone is rotated and faces backwards. This makes it prominent and easily damaged, especially from a fall or during childbirth. In general, the tailbone can be injured in any fall that lands the person on the base of their
spine.
In most instances of a
fractured coccyx,
the bones will heal naturally and without active medical treatment. Just make sure that they are rested and not stressed too much by
sitting.
For more information on tailbone pain, see my
coccyx pain
resource section.
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5/20/06 Revised 11/11/08

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