Synaptic Integration of Thalamic and Limbic Inputs in Rodent Gustatory Cortex

VPMpc (Ventral posteromedial nucleus of the thalamus, parvicellular part) UBERON:0003018 functionally connects to GU (Gustatory areas) UBERON:8440075 · Rat

Electrical stimulation of VPMpc evoked short-latency, monosynaptic-like depolarizing PSPs in GC regular-spiking neurons recorded intracellularly in vivo. The early component reversed near the AMPA reversal potential, and in half of the neurons tested it was followed by a polysynaptic GABAA-like inhibitory component.

Fig. 3C-F; Results, 'Thalamus-evoked monosynaptic responses in GC neurons'

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BLA (basal amygdaloid nucleus) UBERON:0002887 functionally connects to GU (Gustatory areas) UBERON:8440075 · Rat

BLA stimulation evoked PSPs in GC neurons with onset delays consistent with monosynaptic input. The responses had early excitatory and later inhibitory components, and some GC neurons responded to both BLA and VPMpc. Single BLA shocks or 20-Hz BLA bursts given before VPMpc stimulation enhanced or suppressed VPMpc-evoked PSPs, depending on timing.

Figs. 4C, 5, 6, 7, 8A; Results

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VPMpc (Ventral posteromedial nucleus of the thalamus, parvicellular part) UBERON:0003018 projects to GU (Gustatory areas) UBERON:8440075 · Rat

AAV9-driven GFP or RFP injected into VPMpc labelled axons in GC, concentrated in the granular and dysgranular subdivisions and found to some degree in all subdivisions. The fields overlapped most with BLA axons in dysgranular GC.

Fig. 1A, C-E; Results, first section

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BLA (basal amygdaloid nucleus) UBERON:0002887 projects to GU (Gustatory areas) UBERON:8440075 · Rat

Anterograde AAV9 fluorescent labelling from BLA showed direct axonal projections to GC. They lay mainly in the dysgranular and agranular subdivisions, more ventrally than VPMpc axons.

Fig. 1B-E; Results, first section

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