Which cervical vertebra has no body and no spinous process?

• A. C2
• B. C1
• C. C3
• D. C4

Answer: (B)

The cervical vertebra that has no body and no spinous process is C1, also known as the atlas. The atlas is unique among the vertebrae because it supports the skull and allows for the nodding motion of the head. It comprises an anterior arch and a posterior arch, along with lateral masses and no traditional vertebral body.

This anatomical structure is crucial as it facilitates the articulation with the occipital condyles of the skull, allowing for a greater range of motion compared to other cervical vertebrae. The absence of a spinous process is also a distinguishing feature that differentiates C1 from other vertebrae, as it instead has an anterior tubercle. This structural uniqueness is vital for its function in providing support and facilitating movement in the cervical region.