Central nervous system pathology is characterized by distinct cellular responses to injury and specific molecular mechanisms underlying neurodegenerative disorders. The core theoretical framework defines glial cell lineages (neuroectodermal vs. mesodermal), myelination agents (oligodendrocytes in CNS, Schwann cells in PNS), and the structural consequences of hypoxia (red neurons) or viral cytopathies (Rosenthal fibers). Neurodegeneration is mechanistically explained by protein aggregation theories: Alzheimer's disease involves hyperphosphorylated tau neurofibrillary tangles within neurons and amyloid-beta plaques extracellularly disrupting acetylcholinergic transmission, while Parkinsonism results from the loss of dopaminergic substantia nigra pars compacta neurons leading to rigidity. Furthermore, congenital anomalies arise from neural tube closure failures (encephalocele/spina bifida) due to folate deficiency or developmental defects like Dandy-Walker malformation, whereas genetic neurodegenerative conditions are defined by specific trinucleotide repeat expansions such as CAG in Huntington's disease and GAA in Friedreich ataxia.
Central nervous system pathology is characterized by distinct cellular responses to injury and specific molecular mechanisms underlying neurodegenerative disorders. The core theoretical framework def…