Table 1

Axon initial segment (AIS) origin, length, distance from the soma and voltage-gated sodium (Nav) channel composition in α and γ motor neurons (MNs)

AIS origin

Length (μm)

Distance from the soma (μm)

Nav composition


Nav1.1/Nav1.6

Nav1.6


α-MN

Dendritic (15%)

(n = 19)

29.5 ± 3.2

(n = 6)

16.9 ± 13.2

(n = 6)

100%

(n = 18)

0%

(n = 18)


Somatic (85%)

(n = 61)

29.3 ± 5.4

(n = 26)

5.6 ± 3.8

(n = 26)

79.8%,

(n = 35)

20.2%

(n = 35)


γ-MN

Somatic (100%)

(n = 69)

28 ± 8.7

(n = 69)

8.1 ± 3.5

(n = 69)

81.2%

(n = 43)

18.8%

(n = 43)


Duflocq et al. BMC Biology 2011 9:66   doi:10.1186/1741-7007-9-66

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