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Table 2 Quantitative parameters of morphoelectrotonic transforms (METs)

From: Somato-dendritic morphology and dendritic signal transfer properties differentiate between fore- and hindlimb innervating motoneurons in the frog Rana esculenta

  MET descriptor Cervical MNs Lumbar MNs
RN = 1.4 MΩ RN = 5 MΩ RN = 1.4 MΩ RN = 5 MΩ
Homogeneous membrane Combined MET length (λ) 439.9 ± 66.2 * 260.7 ± 25.6* 819.8 ± 130.4 * 434.7 ± 32.5 *
  Mean length (λ) 3.6 ± 0.6 2.1 ± 0.2 3.7 ± 0.5 2.0 ± 0.1
  Mean parent length (λ) 2.2 ± 0.3 1.1 ± 0.1 2.2 ± 0.3 1.3 ± 0.1
  Mean distance to BRP (λ) 5.7 ± 0.8 3.4 ± 0.2 7.1 ± 1.1 4.3 ± 0.4
  Mean distance to ENDP (λ) 12.9 ± 1.9 7.3 ± 0.5 14.2 ± 2.0 8.1 ± 0.6
  Max. distance of ENDP (λ) 24.8 ± 3.7 12.9 ± 1.2 28.7 ± 4.1 14.5 ± 1.3
Inhomogeneous membrane Combined MET length (λ) 181.8 ± 26.8 * 169.4 ± 16.6 * 302.5 ± 18.7* 288.0 ± 17.9 *
  Mean length (λ) 1.4 ± 0.2 1.3 ± 0.1 1.4 ± 0.1 1.3 ± 0.1
  Mean parent length (λ) 1.2 ± 0.1 0.9 ± 0.1 1.1 ± 0.1 1.1 ± 0.2
  Mean distance to BRP (λ) 4.1 ± 0.5 2.9 ± 0.1 * 4.8 ± 0.3 3.6 ± 0.2 *
  Mean distance to ENDP (λ) 6.7 ± 0.8 5.4 ± 0.2 7.4 ± 0.4 6.0 ± 0.3
  Max. distance of ENDP (λ) 9.3 ± 1.2 7.8 ± 0.4 10.5 ± 0.7 9.2 ± 0.6
  1. MET descriptors were measured in cervical and lumbar limb moving MNs with homogeneous (Rms = Rmd) and inhomogeneous (Rms < Rmd) soma-dendritic membranes and with different neuron resistances. Measures of length of dendrites in METs are in units of generalized space constant (λ). Variables with statistically significant differences in pair-wise comparisons of METs of MNs from different spinal segments were marked by asterisks (Mann–Whitney test, p < 0.05). BRP and ENDP abbreviate branch points and end points, RN is the neuron resistance.