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What is often called the spine refers to a group of bone known as the vertebral column. This column is composed of vertebrae, the sacrum, and the coccyx.

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The spine is more specifically composed of the neck bones, or "C" vertebrae, so-called because their true names are "Cervical". There are 5 of these, the top two being also called the Atlas and the Axis.

Next, named after the thorax of the body are the thoracic, or "T" vertebrae. There are 12 of these, T-1 through T-12.

The small of the back, or Lumbar area, is composed of 5 "L", or Lumbar bones.

The two spinal section between the 2 rear bones of the hips is actually part of the spine: The Sacrum. There are usually 5 "S" or Sacral vertebrae, and they are usually all fused together in adulthood. They sit like a wedge between the hipbones.

And at the very bottom are the 3 or 4 bones of the coccyx, or "Tailbone". These coccygial bones are also fused together by adulthood.

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Related Questions

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vertebrae


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