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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-15 and was most recently seen on 2026-08-15.
The trisynaptic circuit or trisynaptic loop is a relay of synaptic transmission in the hippocampus.
The trisynaptic circuit is a neural circuit in the hippocampus, which is made up of three major cell groups: granule cells in the dentate gyrus, pyramidal neurons in CA3, and pyramidal neurons in CA1. The hippocampal relay involves three main regions within the hippocampus which are classified according to their cell type and projection fibers. The first projection of the hippocampus occurs between the entorhinal cortex (EC) and the dentate gyrus (DG). The entorhinal cortex transmits its signals from the parahippocampal gyrus to the dentate gyrus via granule cell fibers known collectively as the perforant path. The dentate gyrus then synapses on pyramidal cells in CA3 via mossy cell fibers. CA3 then fires to CA1 via Schaffer collaterals which synapse in the subiculum and are carried out through the fornix of the brain. Collectively the dentate gyrus, CA1, and CA3 of the hippocampus compose the trisynaptic loop.
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