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The characteristic that is not associated with thoracic vertebrae is the short thick spinous process. Thoracic vertebrae are known for their long spinous processes, which project downward and provide additional surface area for muscle attachment and stability to the spine. Additionally, these vertebrae articulate with the ribs, which is a key feature of thoracic vertebrae, allowing for the attachment and support of the rib cage.

The presence of transverse foramen is specific to cervical vertebrae, where they support the vertebral arteries. Since thoracic vertebrae do not have transverse foramen, this further distinguishes them from cervical vertebrae. Focusing on the characteristics of thoracic vertebrae, it is clear that long spinous processes, articulation with ribs, and their distinctive structures play a critical role in defining their anatomy and function.