Which one of the following features is only found on a cervical vertebra?

Question

BlackTom AI · Accepted Answer

Question restatement: Which feature is found only on a cervical vertebra?

Option a: Anterior arch. This structure is a distinctive feature of the atlas (C1), the first cervical vertebra. The atlas has an anterior arch (and a posterior arch) that forms part of its ring-like structure, a feature not present in thoracic or lumbar vertebrae. Therefore, this option points to a feature unique to the cervical region, specifically the atlas.

Option b: Transverse process. While all vertebrae have a transverse process as a general feature, the cervical vertebrae possess a distinctive transverse foramen within the transverse process, which is not found in thoracic or lumbar vertebrae. However, the transverse process itself is not unique to cervical vertebrae since other regions also have transverse processes. Thus, this option is not exclusively cervical.

Option c: Costal facet. Costal facets are articulations for ribs and are characteristic of thoracic vertebrae. They are not features of cervical vertebrae, so this option is not correct for identifying a cervical-only feature.

Option d: Mamillary process. The mamillary process is a feature typically associated with lumbar vertebrae, where it serves as a site for muscle attachment and ligamentous attachments. It is not found in cervical vertebrae, making it incompatible with the question’s premise.

Option e: Superior vertebral notch. Superior vertebral notches are present in many vertebrae as part of the vertebral foramen framework, and are not exclusive to cervical vertebrae. This makes it an inappropriate choice for a feature unique to the cervical region.

Summary of reasoning: Among the options, the anterior arch is the structure that is specifically associated with the atlas (C1) in the cervical region, making it unique to cervical vertebrae. The other options describe features that either appear in other parts of the spine (transverse process in general), are characteristic of other regions (costal facet in thoracic, mamillary process in lumbar), or are not exclusive to the cervical spine (superior vertebral notch).

Which one of the following features is only found on a cervical vertebra?

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