Which of the structure listed below is peculiar to the axis vertebra?
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Correct Answer: Option A
Explanation:
Answer: A. Odontoid process
The odontoid process, also called the dens, is a unique feature of the axis vertebra (the second cervical vertebra, C2). It protrudes upward and fits into the atlas (C1), allowing the head to rotate from side to side.
B. Anterior zygapophysis – Present in most vertebrae; involved in articulation with adjacent vertebrae.
C. Posterior zygapophysis – Also found in most vertebrae for articulation.
D. Lateral spine – Not a specific feature of the axis vertebra.
E. Centrum – The central body of a vertebra, present in all vertebrae, not specific to the axis.
Answer: A. Odontoid process
The odontoid process, also called the dens, is a unique feature of the axis vertebra (the second cervical vertebra, C2). It protrudes upward and fits into the atlas (C1), allowing the head to rotate from side to side.
B. Anterior zygapophysis – Present in most vertebrae; involved in articulation with adjacent vertebrae.
C. Posterior zygapophysis – Also found in most vertebrae for articulation.
D. Lateral spine – Not a specific feature of the axis vertebra.
E. Centrum – The central body of a vertebra, present in all vertebrae, not specific to the axis.