Skip to main content

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.