The number of spinal nerves in human is

Options

A. 10 pairs
B. 12 pairs
C. 43 pairs
D. 31 pairs

Answer

To determine the number of spinal nerves in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Spinal Nerves**:
- Spinal nerves are mixed nerves that carry motor, sensory, and autonomic signals between the spinal cord and various parts of the body.

2. **Counting the Pairs of Spinal Nerves**:
- Humans have a total of 31 pairs of spinal nerves.

3. **Distribution of Spinal Nerves**:
- The spinal nerves are categorized into different regions:
- **Cervical Region**: 8 pairs
- **Thoracic Region**: 12 pairs
- **Lumbar Region**: 5 pairs
- **Sacral Region**: 5 pairs
- **Coccygeal Region**: 1 pair

4. **Calculating the Total**:
- Adding these together gives:
- 8 (Cervical) + 12 (Thoracic) + 5 (Lumbar) + 5 (Sacral) + 1 (Coccygeal) = 31 pairs

5. **Identifying the Correct Answer**:
- Based on the options provided:
- 10 pairs: Incorrect
- 12 pairs: Incorrect
- 43 pairs: Incorrect
- 31 pairs: Correct

### Final Answer:
- The number of spinal nerves in humans is **31 pairs**.

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