How many pairs of spinal nerves are there in human body?

Options

A. 12
B. 32
C. 35
D. 31

Explanation

To determine how many pairs of spinal nerves are present in the human body, we can follow these steps:

1. **Identify the Types of Spinal Nerves**: The human body has different regions of spinal nerves. These are categorized as follows:
- Cervical nerves
- Thoracic nerves
- Lumbar nerves
- Sacral nerves
- Coccygeal nerves

2. **Count the Pairs in Each Category**:
- **Cervical Nerves**: There are 8 pairs of cervical nerves (C1 to C8).
- **Thoracic Nerves**: There are 12 pairs of thoracic nerves (T1 to T12).
- **Lumbar Nerves**: There are 5 pairs of lumbar nerves (L1 to L5).
- **Sacral Nerves**: There are 5 pairs of sacral nerves (S1 to S5).
- **Coccygeal Nerves**: There is 1 pair of coccygeal nerves (Co1).

3. **Add the Pairs Together**:
- Total pairs of spinal nerves = 8 (cervical) + 12 (thoracic) + 5 (lumbar) + 5 (sacral) + 1 (coccygeal) = 31 pairs.

4. **Conclusion**: Therefore, the total number of pairs of spinal nerves in the human body is **31 pairs**.