http://en.wikipedia.org/wiki/Vertebral_column
The centra of the vertebra can be classified based on the fusion of its elements. In aspidospondyly, bones such as the spinous process, the pleurocentrum and the intercentrum are separate ossifications. Fused elements, however, classify a vertebra as having holospondyly.
The centra of the vertebra can be classified based on the fusion of its elements. In aspidospondyly, bones such as the spinous process, the pleurocentrum and the intercentrum are separate ossifications. Fused elements, however, classify a vertebra as having holospondyly.
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