Neural spine of atlas vertebra of man is directed in the

Options

A. Upward and backward direction
B. Upward and forward direction
C. Downward and backward direction
D. Absent.

Answer

To answer the question regarding the direction of the neural spine of the atlas vertebra in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Anatomy of the Atlas Vertebra**:
- The atlas is the first cervical vertebra (C1) in the human spine. It supports the skull and allows for the nodding motion of the head.

2. **Identify the Features of the Atlas**:
- The atlas consists of an anterior arch and a posterior arch, along with elongated transverse processes.

3. **Examine the Neural Spine**:
- The neural spine, also known as the spinous process, is a bony projection on the vertebrae that typically serves as an attachment point for muscles and ligaments.

4. **Determine the Presence of the Neural Spine in the Atlas**:
- In the case of the atlas vertebra, it is important to note that the neural spine is **absent**. This is a unique feature of the atlas compared to other vertebrae.

5. **Conclude the Direction of the Neural Spine**:
- Since the neural spine is absent in the atlas vertebra, it cannot be directed in any specific direction (upward, downward, forward, or backward).

6. **Select the Correct Option**:
- Based on the analysis, the correct answer to the question is that the neural spine of the atlas vertebra of man is **absent**.

### Final Answer:
The neural spine of the atlas vertebra of man is directed in the **absent** direction.

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