part of part of cortical layer VI dorsolateral prefrontal cortex dorsolateral prefrontal cortex layer 6 UBERON:0035158 PBA:12990 layer VI of dorsolateral prefrontal cortex dlPFC6 dlPF6 NLX:156736 Innermost layer of dorsolateral prefrontal cortex lying deep to the internal pyramidal cell layer 5. It is cytoarchitectonically defined in the DLPFC by cells of varying sizes. DLPFC layer 6a is characterized by more neurons and layer 6b has comparatively more glia.