Evaluate the challenges of treating diseases of the central nervous system compared to other organ systems.

• ACNS diseases are easy to treat because the brain regenerates quickly
• BCNS diseases are particularly difficult: the blood-brain barrier excludes many drugs; neurones have limited regenerative capacity so lost function may be permanent; the brain's complexity means side effects can be unpredictable; surgery risks permanent functional loss; and many conditions (e.g. Alzheimer's) are not fully understood mechanistically
• CCNS diseases are no different from other diseases
• DCNS treatment is easier because all CNS drugs work the same way

Choose an answer — or press 1234