Differences between somatic and dendritic inhibition in the hippocampus

Richard Miles, Katalin Tóth, Attila I. Gulyás, Norbert Hájos, Tamas F. Freund

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Hippocampal synaptic inhibition is mediated by distinct groups of inhibitory cells. Some contact pyramidal cells perisomatically, while others terminate exclusively on their dendrites. We examined perisomatic and dendritic inhibition by recording from CA3 inhibitory and pyramidal cells and injecting biocytin to visualize both cells in light and electron microscopy. Single perisomatic inhibitory cells made 2-6 terminals clustered around the soma and proximal pyramidal cell processes. Dendritic cells established 5-17 terminals, usually on different dendrites of a pyramidal cell. Perisomatic terminals were larger than those facing dendritic membrane. Perisomatic inhibitory cells initiated the majority of simultaneous IPSPs seen in nearby pyramidal cells. Single IPSPs initiated by perisomatic inhibitory cells could suppress repetitive discharge of sodium-dependent action potentials. Activation of inhibitory fibers terminating on dendrites could suppress calcium-dependent spikes. Thus, distinct inhibitory cells may differentially control dendritic electrogenesis and axonal output of hippocampal pyramidal cells.

Original languageEnglish
Pages (from-to)815-823
Number of pages9
Issue number4
Publication statusPublished - Apr 1996

ASJC Scopus subject areas

  • Neuroscience(all)

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