These are twelve vertebra of
the mid back. The last vertebra (on the left side of the picture) attaches
to the lumbar (lower) spine, and the top vertebra (on the right) attaches
to the cervical (neck) section of the back. The vertebra are broader and
stronger than the cervical bones. This allows them to absorb the added
pressure applied to the mid back, but they remain a common sight of
injury. The vertebra are numbered from one to twelve and labeled T1, T2,
T3 etc. from the upper most bones to the lowest.
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