Properties of basal dendrites of layer 5 pyramidal neurons: a direct patch-clamp recording study.

Abstract:

:Basal dendrites receive the majority of synapses that contact neocortical pyramidal neurons, yet our knowledge of synaptic processing in these dendrites has been hampered by their inaccessibility for electrical recordings. A new approach to patch-clamp recordings enabled us to characterize the integrative properties of these cells. Despite the short physical length of rat basal dendrites, synaptic inputs were electrotonically remote from the soma (>30-fold excitatory postsynaptic potential (EPSP) attenuation) and back-propagating action potentials were significantly attenuated. Unitary EPSPs were location dependent, reaching large amplitudes distally (>8 mV), yet their somatic contribution was relatively location independent. Basal dendrites support sodium and NMDA spikes, but not calcium spikes, for 75% of their length. This suggests that basal dendrites, despite their proximity to the site of action potential initiation, do not form a single basal-somatic region but rather should be considered as a separate integrative compartment favoring two integration modes: subthreshold, location-independent summation versus local amplification of incoming spatiotemporally clustered information.

journal_name

Nat Neurosci

journal_title

Nature neuroscience

authors

Nevian T,Larkum ME,Polsky A,Schiller J

doi

10.1038/nn1826

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

206-14

issue

2

eissn

1097-6256

issn

1546-1726

pii

nn1826

journal_volume

10

pub_type

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