This concept covers embryogenesis of the neural tube and its associated cortical malformation defects within pediatric neuropathology, tracing brain tissue differentiation from the ectoderm through neurulation, vesicle formation, and cortical proliferation/migration. Failure at each stage of this timed developmental sequence produces a distinct, stage-specific malformation: neural tube closure failure yields anencephaly/encephalocele (anterior) or spina bifida variants (posterior); failure of prosencephalon cleavage yields holoprosencephaly; and failure of neuronal migration yields cortical surface anomalies such as lissencephaly, pachygyria, and schizencephaly. The unifying principle is that the embryological timing and location of a developmental failure directly determines the resulting pathology's location and phenotype.
This concept covers embryogenesis of the neural tube and its associated cortical malformation defects within pediatric neuropathology, tracing brain tissue differentiation from the ectoderm through n…