What is the anatomy and physiology of dementia?

Dementia is characterized by the progressive degeneration of brain cells, particularly affecting areas responsible for memory, thinking, and behavior. Neuroanatomically, it often involves the shrinkage of the hippocampus and cerebral cortex, with the accumulation of abnormal protein deposits, such as amyloid plaques and tau tangles in Alzheimer's disease. Physiologically, this leads to disrupted neurotransmission, particularly involving acetylcholine and glutamate, contributing to cognitive decline and impairments in daily functioning. Overall, dementia represents a complex interplay of structural and biochemical changes in the brain.