In mouse cortex, layer-5 pyramidal cells of the frontal cortex — but not other…

In mouse cortex, layer-5 pyramidal cells of the frontal cortex — but not other cortical regions — establish monosynaptic connections with the inhibitory thalamic reticular nucleus, paralleling but distinct in morphology and physiology from the canonical L6-TRN projection, and providing a specialized cortical control over intrathalamic inhibition.

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  "doi": "10.1038/s41593-022-01217-z",
  "claim": "In mouse cortex, layer-5 pyramidal cells of the frontal cortex — but not other cortical regions — establish monosynaptic connections with the inhibitory thalamic reticular nucleus, paralleling but distinct in morphology and physiology from the canonical L6-TRN projection, and providing a specialized cortical control over intrathalamic inhibition.",
  "cite_key": "Hadinger2023",
  "evidence": "Cortex-wide anterograde tracing, optogenetic input mapping, and slice/in vivo electrophysiology of L5 pyramidal cell inputs to TRN across multiple mouse cortical areas.",
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  "study_system": "mouse frontal vs non-frontal cortex L5 pyramidal cells → thalamic reticular nucleus",
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Specifically, L5 pyramidal cells of the frontal cortex, but not other cortical regions, establish monosynaptic connections with the inhibitory thalamic reticular nucleus (TRN). The frontal L5-TRN pathway parallels the L6-TRN projection but has distinct morphological and physiological features.

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