The human neural system consists of central neural system (CNS) and peripheral neural system (PNS), how many statements correct for human neural system?
i. The CNS includes the brain and the spinal cord
ii. The PNS comprises of all the nerves of the body associated with the CNS
iii. PNS consist of cranial nerve and spinal nerve
iv. The PNS is divided into two divisions called somatic neural system and autonomic neural system
v. The efferent nerve fibres of PNS transmit impulses from tissues/organs to the CNS
vi. Afferent fibres of PNS transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs.

Options

A. Less than four
B. Four
C. More than four
D. None of these

Answer

To determine how many statements about the human neural system are correct, we will evaluate each statement one by one.

### Step-by-Step Solution:

1. **Statement i: The CNS includes the brain and the spinal cord.**
- This statement is **correct**. The Central Nervous System (CNS) is indeed composed of the brain and spinal cord.

2. **Statement ii: The PNS comprises all the nerves of the body associated with the CNS.**
- This statement is also **correct**. The Peripheral Nervous System (PNS) includes all the nerves that branch out from the CNS to the rest of the body.

3. **Statement iii: PNS consists of cranial nerve and spinal nerve.**
- This statement is **correct** as well. The PNS includes cranial nerves (12 pairs) and spinal nerves (31 pairs) that connect the CNS to limbs and organs.

4. **Statement iv: The PNS is divided into two divisions called somatic neural system and autonomic neural system.**
- This statement is **correct**. The PNS is indeed divided into the somatic nervous system (which controls voluntary movements) and the autonomic nervous system (which controls involuntary functions).

5. **Statement v: The efferent nerve fibres of PNS transmit impulses from tissues/organs to the CNS.**
- This statement is **incorrect**. Efferent nerve fibers actually transmit impulses from the CNS to the tissues/organs, not the other way around.

6. **Statement vi: Afferent fibres of PNS transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs.**
- This statement is also **incorrect**. Afferent fibers transmit sensory information from the peripheral tissues/organs to the CNS, not the reverse.

### Summary of Correct Statements:
- Correct Statements: i, ii, iii, iv
- Incorrect Statements: v, vi

### Conclusion:
Out of the six statements, **four statements are correct** (i, ii, iii, iv).

### Final Answer:
**4 statements are correct.**

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