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In human being , the second cervical ver...

In human being , the second cervical vertebra helps in rotatory movements of head through know-like process called `:`

A

Prezygapohysis

B

Postzygapolysis

C

Postzygapohysis

D

Odontoid process

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Cervical Vertebrae**: In humans, the cervical vertebrae are the first seven vertebrae in the neck region. The second cervical vertebra is specifically known as the axis. 2. **Understand the Function of the Axis**: The axis (second cervical vertebra) plays a crucial role in the rotation of the head. It allows the head to turn from side to side. 3. **Recognize the Structure Involved**: The axis has a unique structure called the odontoid process, which is a peg-like projection that extends upward. 4. **Connection with the Atlas**: The first cervical vertebra, known as the atlas, sits on top of the axis. The atlas supports the skull and allows for nodding movements. 5. **Mechanism of Rotatory Movement**: When the head rotates, it pivots around the odontoid process of the axis. This arrangement allows for a wide range of motion in the neck. 6. **Conclusion**: The knob-like process that facilitates the rotatory movements of the head through the second cervical vertebra (axis) is called the odontoid process. **Final Answer**: The knob-like process is called the **odontoid process**. ---
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