Hippocampal interlamellar cell–cell connectome that counts. Issue 11 (5th September 2022)

• Record Type: Journal Article
• Authors: Pak, Sojeong; Jang, Doohyeong; Lee, Jinho; Choi, Gona; Shin, Hongseong; Yang, Sungchil; Yang, Sunggu
• Is Part Of: Journal of cellular physiology. Volume 237:Issue 11(2022)
• Page Start: 4037
• Page End: 4048
• Publication Date: 2022-09-05
• Subjects: feedforward network -- longitudinal connection -- place coding -- spatial memory -- synaptic plasticity; Physiology -- Periodicals; Cell physiology -- Periodicals; 571.6
• DOI: 10.1002/jcp.30868
• Languages: English
• ISSNs: 0021-9541

Abstract

Abstract: The hippocampus is regarded as a cognition hub, particularly for learning and memory. Previously, neuronal mechanisms underlying various cognitive functions are delineated with the lamellar hippocampal circuitry, dentate gyrus—CA3 or CA2—CA1, within the transverse plane. More recently, interlamellar (often referred to as longitudinal) projections have received intensive attention to help understand signal convergence and divergence in cognition and behavior. Signal propagation along the longitudinal axis is evidenced by axonal arborization patterns and synaptic responses to electro‐ and photo‐stimulation, further demonstrating that information flow is more enriched in the longitudinal plane than the transverse plane. Here, we review the significance of longitudinal connections for cognition, discuss a putative circuit mechanism of place coding, and suggest the reconceptualization of the hippocampal circuitry.