The axis vertebra is also known as C2.

Appeared in: BTSC Staff Nurse 31 July-2025

Explanation

The question asks to identify the axis vertebra, which is a core concept in spinal anatomy.
The axis is the second cervical vertebra, universally designated as C2.
Its most defining feature is the dens (odontoid process), which acts as a pivot for the C1 vertebra (atlas) and the skull to rotate upon.
This C1-C2 articulation, the atlanto-axial joint, is responsible for the side-to-side 'no' motion of the head.

Option B: C6 is a 'typical' cervical vertebra in the lower part of the neck and does not have the unique features of the axis.
Option C: C7 is known as the 'vertebra prominens' due to its long, easily palpable spinous process, but it is not the axis.
Option D: C1 is the atlas, the vertebra that sits directly on top of the axis (C2). It is a distinct bone with its own unique features and functions.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Cervical Spine as background academic context rather than a clinical decision trigger.
Understanding the anatomy of the axis (C2) is critical for recognizing and managing cervical spine injuries.
Fractures of the C2 vertebra are common, particularly fractures of the dens (odontoid fractures) and traumatic spondylolisthesis of the axis (Hangman's fracture). These injuries can lead to spinal cord damage and instability.
Nurses must be vigilant in assessing for neurological deficits and maintaining spinal immobilization in patients with suspected C2 injuries to prevent further harm.

How to Approach the Question

This is a factual recall question testing basic anatomical knowledge.
First, identify the key term in the question: 'axis vertebra'.
Recall the names and numerical designations of the cervical vertebrae.
The first two cervical vertebrae have unique names: C1 is the atlas, and C2 is the axis.
Match the term 'axis' with its corresponding number, C2.
Evaluate the other options to confirm they are incorrect. C1 is the atlas, and C6/C7 are lower cervical vertebrae with different characteristics.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 2 Part 2 pp. 12-14, 14-16, 13-15

Practise the full BTSC Staff Nurse 31 July-2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.