Axis vertebra is identified by

Options

A. signoid notch
B. odontoid process
C. deltoid
D. centrum

Answer

To identify the Axis vertebra, follow these steps:

1. **Understand the Cervical Vertebrae**: The human cervical spine consists of seven vertebrae, labeled C1 to C7. The first two cervical vertebrae are unique and are known as the Atlas (C1) and Axis (C2).

2. **Identify the Axis Vertebra**: The Axis vertebra is the second cervical vertebra (C2) and is crucial for the rotation of the head.

3. **Recognize Key Features of the Axis**: The Axis is characterized by a prominent structure known as the odontoid process (also called the dens), which is a tooth-like projection.

4. **Function of the Odontoid Process**: The odontoid process projects upward and articulates with the anterior arch of the Atlas (C1), forming a pivot joint. This joint allows for the rotation of the head.

5. **Select the Correct Answer**: Given the options provided in the question, the Axis vertebra is specifically identified by the presence of the odontoid process. Therefore, the correct answer is option B: Odontoid process.