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There are 33 vertebrae in the human spine. (7 cervicals, 12 thoracic, 5 lumbar, 5 that fuse into the sacrum and 4 that fuse into the coccyx.). The sacrum and coccyx are already fused into their respective bones at birth.
There are 33 vertebrate in the human spine. There are 7 cervical, 12 thoracic, 5 lumbar, 5 that fuse into the sacrum, and 4 that fuse into the coccyx.

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Q: How many bones are there in an adult backbone?
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