The prefrontal cortex across scales: laminar architecture, white-matter constraints, and distributed control in cognition.

The prefrontal cortex (PFC) is often treated as the anatomical seat of executive control. We defend a distributed but structurally constrained account. The PFC is not an exclusive executive locus; it is a transient and structurally tuned cortical interface in which laminar differentiation, molecular tuning, recurrent synaptic persistence, thalamocortical embedding, and long-range connectivity converge to support context-sensitive control. We review prefrontal organization across genomic and transcriptomic patterning, receptor architecture, synaptic and interneuronal organization, laminar microcircuitry, white-matter constraints, and large-scale network dynamics. We argue that canonical cortical motifs are prefrontally parameterized toward four operations: convergence, filtering, maintenance, and feedback. Inputs are selected through molecularly tuned and inhibitory-gated laminar compartments; task-relevant states are stabilized through recurrent, neuromodulation-sensitive synaptic regimes; and selected states are exported through deep-layer corticocortical, corticostriatal, and corticothalamic channels. Evidence from gradual cortical damage, particularly low-grade glioma, suggests that preserved cognition after prefrontal injury is better explained by network-constrained functional reinstantiation than by strict regional essentialism. Yet compensation should not be equated with unconstrained migration of function; whether it depends on partial microcircuital convergence, synaptic re-weighting, network redistribution, or a combination of these mechanisms remains an open empirical question. Finally, we organize these mechanisms across encoding, maintenance/manipulation, and retrieval, arguing that prefrontal participation is temporally structured rather than statically localized. Progress will require a spatiotemporal multiscale atlas linking molecularly parameterized laminar motifs, tract engagement, and network interactions across cognitive stages.