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The forebrain.

pros′en·ce·phal′ic (-sə-făl′ĭk) adj.
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References in periodicals archive ?
8] Central Nervous System (CNS) abnormalities associated with MKS include Dandy-Walker malformation, agenesis of the corpus callosum, microcephaly, rhombic roof dysgenesis and prosencephalic dysgenesis.
Fetal cerebral malformation, predominantly of impaired prosencephalic development namely agenesis of the corpus callosum and septo-optic dysplasia, is the main pathological feature in fetus, and causes prominent neurodevelopmental retardation, and associated with congenital facial anomalies and visual disorders [1-3].
2) Raybaud and co-workers were the first to recognise the ectatic venous structure that is characteristically seen in these lesions representing the median prosencephalic vein (MPV) and not the vein of Galen itself.