Which anatomical components constitute the human central nervous system (CNS)?
Answer and explanation
Correct answer: D. Brain and spinal cord
- Step 1: Recall the structural division of the nervous system: the human nervous system is divided into the central nervous system (CNS) and peripheral nervous system (PNS).
- Step 2: The central nervous system consists exclusively of the brain and the spinal cord, which serve as the primary integration and processing centers.
Answer
Brain and spinal cord.
Why not the others: 'Cranial nerves and spinal nerves' constitute the peripheral nervous system (PNS); 'Sensory receptors and motor neurons' are functional components of peripheral pathways; 'Sympathetic and parasympathetic chains' comprise the autonomic division of the PNS.
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