Differences in excitability properties of FDI and ADM motor axons.

Abstract:

:The first dorsal interosseous (FDI) and abductor digiti minimi (ADM) muscles are innervated by the same ulnar nerve, but studies have shown that the former is much more severely affected in amyotrophic lateral sclerosis. In this study, threshold tracking was used to investigate whether membrane properties differ between FDI and ADM motor axons. In 12 normal subjects, compound muscle action potentials were recorded from FDI and ADM after ulnar nerve stimulation at the wrist. The strength-duration time constant was significantly longer in the FDI axons than in the ADM axons, and latent addition studies showed greater threshold changes at the conditioning-test stimulus of 0.2 ms in FDI than in ADM axons. These findings suggest that nodal persistent sodium conductances are more prominent in FDI axons than in ADM axons, and therefore excitability is physiologically higher in FDI axons. Even in the same nerve at the same sites, membrane properties of FDI and ADM motor axons differ significantly, and thus their axonal/neuronal responses to disease may also differ.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Bae JS,Sawai S,Misawa S,Kanai K,Isose S,Kuwabara S

doi

10.1002/mus.21107

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

350-4

issue

3

eissn

0148-639X

issn

1097-4598

journal_volume

39

pub_type

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