Correct Option
The correct option is 2 and 3 only.
Explanation
The human neural system is structurally and functionally divided into two main components: the Central Neural System (CNS) and the Peripheral Neural System (PNS). These systems collaborate to receive sensory input, process information, and execute motor responses.
Statement-wise Analysis
- Statement 1 is Incorrect: The Central Neural System (CNS) does not consist of the brain alone. It comprises both the brain and the spinal cord. Together, these structures form the main axis of the body's nervous system.
- Statement 2 is Correct: The Peripheral Neural System (PNS) comprises all the nerves of the body associated with the CNS. This includes cranial nerves (originating from the brain) and spinal nerves (originating from the spinal cord), which connect the CNS to peripheral tissues and organs.
- Statement 3 is Correct: The CNS acts as the command center of the body. It is the primary site for information processing and control, where sensory data is integrated and motor commands are generated.
Key Takeaway: The CNS (Brain + Spinal Cord) is the processing unit, whereas the PNS serves as the communication network (via afferent and efferent fibers) connecting the CNS to the rest of the body.