Which cervical vertebra is referred to as the atlas?

• A. C1
• B. C2
• C. C3
• D. C7

Answer: (A)

The cervical vertebra referred to as the atlas is C1. The atlas is the first cervical vertebra and is named after the mythological figure Atlas, who carried the world on his shoulders. This vertebra is unique in its structure as it lacks a typical vertebral body and instead has an anterior and posterior arch, which creates a ring-like shape. This design allows the atlas to support the skull, enabling the nodding motion of the head.

The atlas plays a crucial role in the cervical spine as it articulates with the occipital condyles of the skull, providing a pivotal point for head movement. This connection allows for flexion and extension, commonly referred to as the "yes" motion. Understanding the anatomy of the atlas is essential for professionals in radiography, as injuries or abnormalities in this area can lead to significant neurological issues.