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Scheme of normal and polymicrogyric cortex

On the right side a schematic representation of 4-layered polymicrogyric cortex. Note that the undulating surface of layer 2 is not wound around visible sulci as in the normal cortex, lending the surface a smooth or crenated aspect on macroscopic examination. (Contributed by Peter G Barth MD.)

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Associated Disorders

  • Absence of septum pellucidum
  • Optic nerve hypoplasia
  • Polymicrogyria