Which of the following statements regarding the central nervous system (CNS) is most accurate?
1
The blood-brain barrier (BBB) is permeable to all hydrophilic substances, allowing unrestricted access to the brain tissue
2
Oligodendrocytes are involved in the production of myelin sheaths around axons in the CNS, whereas Schwann cells perform this function in the peripheral nervous system (PNS).
3
Neurogenesis occurs exclusively in the hippocampus and olfactory bulb throughout adulthood, with no other brain regions involved.
4
The central sulcus separates the occipital lobe from the parietal lobe and is crucial for visual and sensory processing.