How many spinal nerves occurs in man ?

Answer

To answer the question "How many spinal nerves occur in man?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Spinal Nerves**:
- Spinal nerves are peripheral nerves that arise from the spinal cord. They are responsible for transmitting sensory and motor information between the spinal cord and the rest of the body.

2. **Identify the Composition of Spinal Nerves**:
- Spinal nerves are mixed nerves, meaning they contain both sensory (afferent) and motor (efferent) fibers.

3. **Determine the Total Number of Spinal Nerve Pairs**:
- In humans, there are a total of 31 pairs of spinal nerves.

4. **Break Down the Types of Spinal Nerves**:
- The 31 pairs of spinal nerves are categorized as follows:
- 8 pairs of cervical nerves (C1-C8)
- 12 pairs of thoracic nerves (T1-T12)
- 5 pairs of lumbar nerves (L1-L5)
- 5 pairs of sacral nerves (S1-S5)
- 1 pair of coccygeal nerves (Co1)

5. **Calculate the Total**:
- Adding these together gives:
- 8 (cervical) + 12 (thoracic) + 5 (lumbar) + 5 (sacral) + 1 (coccygeal) = 31 pairs of spinal nerves.

6. **Conclusion**:
- Therefore, the total number of spinal nerves in humans is 31 pairs.

### Final Answer:
The total number of spinal nerves in man is **31 pairs**.