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Cereb Cortex. 2016 Aug;26(8):3534-43. doi: 10.1093/cercor/bhw144. Epub 2016 May 26.

Cortical Dependence of Whisker Responses in Posterior Medial Thalamus In Vivo.

Author information

1
Institute for Neuroscience of the Technische Universität München, 80802 Munich, Germany Department of Neurosurgery, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany.
2
Institute for Neuroscience of the Technische Universität München, 80802 Munich, Germany.
3
Institute for Neuroscience of the Technische Universität München, 80802 Munich, Germany Max Planck Institute for Neurobiology, 82152 Martinsried, Germany.

Abstract

Cortical layer 5B (L5B) thick-tufted pyramidal neurons have reliable responses to whisker stimulation in anesthetized rodents. These cells drive a corticothalamic pathway that evokes spikes in thalamic posterior medial nucleus (POm). While a subset of POm has been shown to integrate both cortical L5B and paralemniscal signals, the majority of POm neurons are suggested to receive driving input from L5B only. Here, we test this possibility by investigating the origin of whisker-evoked responses in POm and specifically the contribution of the L5B-POm pathway. We compare L5B spiking with POm spiking and subthreshold responses to whisker deflections in urethane anesthetized mice. We find that a subset of recorded POm neurons shows early (<50 ms) spike responses and early large EPSPs. In these neurons, the early large EPSPs matched L5B input criteria, were blocked by cortical inhibition, and also interacted with spontaneous Up state coupled large EPSPs. This result supports the view of POm subdivisions, one of which receives whisker signals predominantly via L5B neurons.

KEYWORDS:

barrel cortex; cortex layer 5; corticothalamic feedback; higher order thalamus; somatosensory

PMID:
27230219
PMCID:
PMC4961024
DOI:
10.1093/cercor/bhw144
[Indexed for MEDLINE]
Free PMC Article

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