Development and dysgenesis of the cerebral cortex: malformations of cortical development

Area of Science:

• Neuroscience
• Developmental Biology
• Embryology

Background:

• The human cerebral cortex exhibits a protracted developmental trajectory, beginning from a pseudostratified epithelium around 5 weeks of gestation.
• Cortical development involves intricate processes including cell proliferation, migration, differentiation, and the establishment of neural connections.

Purpose of the Study:

• To provide a comprehensive overview of the developmental stages of the human cerebral cortex.
• To elucidate the timeline and key events in cortical connectivity and vascularization.
• To outline the classification of malformations of cortical development.

Main Methods:

• Review of established developmental timelines and cellular processes in human cortical development.
• Synthesis of information regarding thalamocortical connectivity and vascular adaptation.
• Classification of cortical malformations based on disrupted developmental stages.

Main Results:

• Cerebral cortex formation progresses from 5 weeks to a near-complete structure by 47 weeks.
• Thalamocortical connections initiate in the third trimester and extend postnatally.
• Vascular development dynamically adapts to ongoing cellular proliferation and network formation.
• Malformations of cortical development are categorized into disorders of specification, proliferation/apoptosis, migration, and organization.

Conclusions:

• Cortical development is a dynamic, multi-stage process involving interconnected cellular and network events.
• While a classification system for cortical malformations exists, the inherent interplay between developmental processes is critical to acknowledge.
• Understanding these complex interactions is essential for comprehending the etiology and potential therapeutic strategies for cortical developmental disorders.