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Table 1 Electrophysiological membrane properties of SI neurons.

From: In vivo patch-clamp analysis of response properties of rat primary somatosensory cortical neurons responding to noxious stimulation of the facial skin

Neuron type No. of neurons RMP (mV) Rin (MΩ) Spontaneous activity
     Firing pattern Firing frequency (Hz)
LTM 6 -58.3 ± 3.5 34.1 ± 4.5 R (4), B (2) 2.6 ± 0.3
WDR 3 -55.1 ± 4.9 36.2 ± 3.1 R (1), B (2) 4.5 ± 1.2
NS 18 -61.5 ± 5.8 39.1 ± 5.2 R (6), B (12) 4.2 ± 0.8
  1. LTM, Low- threshold mechanoreceptive; WDR, wide-dynamic range; NS, nociceptive specific. Resting membrane potential (RMP), the values reported refers to that taken during the hyperpolarized period (down-state) between ongoing spontaneous depolarization (up-state). The input resistance (Rin) was calculated by injecting negative current into the soma and determing the voltage drop after current injection. Firing pattern of spontaneous activity: R, Regular pattern; B, bursting pattern. Values in parentheses are number of neurons.