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Relationship between functional deficiencies and the contribution of myelin nerve fibers derived from L-4, L-5, and L-6 spinolumbar branches in adult rat sciatic nerve.

Abstract：

:The distribution and relative intrafascicular contribution of myelin fibers derived from spinal segments L-4 to L-6 were analyzed in adult rat sciatic nerve and its main branches, using 200-kDa neurofilament subunit immunodetection in previously injured nerve sections in the L-4 or L-5 spinal branch or both. These branches' functional contribution was evaluated 16 days after the injury, using the method of J. Bain, S. Mackinnon, and D. Hunter (1988, Plast. Reconstr. Surg. 83: 129-136). A common topographic intrafascicular distribution was found in 69% of cases, with notable segregation of L-4 and L-5 fibers and a random distribution for L-6 fibers. At sciatic nerve main branch level, L-4 contributes almost entirely to the peroneal nerve, L-5 to the tibial nerve, and L-6 and other branches to the sural nerve. After injury to L-4, a significant reduction in peroneal nerve functional index (PFI) was observed, as was a reduction in print length (PL). Injury to L-5 caused a significant reduction in the sciatic (SFI) and tibial (TFI) functional nerve indices, an increase in PL, and a reduction in the spread between opposite toes (TS). Finally, transection of both L-4 and L-5 was followed by a significant reduction in all functional indices measured, an increase in PL, and a reduction in intermediate toe (ITS) and opposite toe spread (TS). The results indicate a direct relationship between the distribution and contribution of the spinal nerve fibers forming the sciatic nerve and the alteration in functional indices for sciatic, tibial, and peroneal nerves.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Montoya G JV,Ariza J,Sutachán JJ,Hurtado H

doi

10.1006/exnr.2001.7806

keywords:

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

266-74

issue

2

eissn

0014-4886

issn

1090-2430

pii

S0014488601978069

journal_volume

173

pub_type

杂志文章

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