Thoracic vertebrae differ from the other vertebrae in that they contain ________.

Question

BlackTom AI · Accepted Answer

The question asks about what distinguishes thoracic vertebrae from other regions of the spine.
Option 1: costal facets. These are the small articulating surfaces on the bodies and transverse processes of thoracic vertebrae that form joints with the ribs. This feature is characteristic of thoracic vertebrae and is the key anatomical difference from cervical and lumbar vertebrae, which lack these facets.
Option 2: bifid spinous processes. Bifid (split) spinous processes are most typical of cervical vertebrae, not thoracic. While some thoracic vertebrae may have relatively long spinous processes, they are not described as bifid and this trait helps distinguish cervical vertebrae from thoracic.
Option 3: no transverse processes. In fact, thoracic vertebrae do have transverse processes, and they bear costal facets on their ends where the ribs articulate. Saying there are no transverse processes would be incorrect for thoracic vertebrae.
Option 4: transverse foramina. Transverse foramina are a hallmark of cervical vertebrae, allowing passage of the vertebral arteries and veins. Thoracic vertebrae do not possess transverse foramina, making this option incorrect for thoracic anatomy.
In summary, the defining thoracic feature among the options is the presence of costal facets that articulate with ribs, which sets thoracic vertebrae apart from cervical and lumbar vertebrae.

Thoracic vertebrae differ from the other vertebrae in that they contain ________.单项选择题

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