"CNS penetration refers to a substance's ability t

"CNS penetration refers to a substance's ability to pass through the blood-brain barrier (BBB) and enter the central nervous system (CNS), which is restricted to protect the brain from harmful substances. Achieving CNS penetration depends on factors like a substance's lipid solubility, molecular size, and the presence of specific transport mechanisms. Understanding and improving CNS penetration is crucial for developing effective drugs for neurological conditions, though it is often challenging"

So I always thought the BBB just meant the ability to reach the brain
But CNS refers to the ability to also reach the Central Nervous System?

Are the BBB and the CNS one and the same

I dont want to AI it

So I need some answers. Stat lol