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Electrophysiological Study of the Posterior Cutaneous Femoral Nerve: Normative Data | OMICS International
ISSN: 2155-9562
Journal of Neurology & Neurophysiology

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Electrophysiological Study of the Posterior Cutaneous Femoral Nerve: Normative Data

Brooks1*, Silva C MD2, Kai MR2 and Leal GXP2

1Setor de Eletroneuromiografia do Instituto de Assistência à Saúde do Servidor Público Estadual de São Paulo – São Paulo- Brasil

2Hospital do Servidor Publico Estadual de São Paulo, São Paulo, Brazil

Corresponding Author:
Dr. Joseph Bruno Bidin Brooks
Setor de Eletroneuromiografia do
Instituto de Assistência à Saúde do Servidor Público
Estadual de São Paulo - Av
Ibirapuera, 981
Vila Clementino/SP - CEP:04029-000
Tel: 55-11-5088-8182
E-mail: [email protected]

Received date: July 15, 2011; Accepted date: October 12, 2011; Published date: October 29, 2011

Citation: Brooks, Silva C2, Kai MR2, Leal GXP (2011) Electrophysiological Study of the Posterior Cutaneous Femoral Nerve: Normative Data. J Neurol Neurophysiol 2:119. doi:10.4172/2155-9562.1000119

Copyright: © 2011 Brooks, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

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Abstract

The posterior cutaneous femoral nerve provides cutaneous inervation of the posterior surface of the thigh and leg, as well as the skin of the perineum. Using Dumitru et al. [1] technique for the assessment of this nerve, we studied one hundred and sixteen limbs from fifty-eight healthy volunteers. The mean values for the posterior cutaneous femoral nerve were as follows: onset latency 2.0 msec (±0.5), amplitude 7.0μV (±2.1), nerve conduction velocity 52 m/s (±4). The assessment of the posterior femoral cutaneous nerve is simple and reproducible. The results of this standardization were similar to the ones described in international literature.

Keywords

Femoral nerve; Posterior cutaneous nerve

Introduction

The posterior cutaneous nerve of the thigh leaves the pelvis through the sciatic foramen, below the piriformis muscle and passes down the buttock and thigh on the medial aspect of the sciatic nerve. It consists of nerve roots from the anterior and posterior divisions of S1, S2 and anterior divisions of S2, S3. The perineal branches provide sensory inervation to the superior medial surface of the thighs, the skin of the scrotum or labia majora. The gluteal branches, turn upward around the lower border of the gluteus maximus, and supply the skin covering the lower and lateral part of that muscle. The main part to the back of the thigh and leg consists of numerous filaments derived from both sides of the nerve, and distributed to the skin covering the back and medial side of the thigh, the popliteal fossa, and the upper part of the back of the leg. The collateral branches from the anterior divisions extend themselves to the quadratus femoris and inferior gemini muscles (L4,L5,S1) and to the internal obturator and superior Gemini muscles (L5,S1,S2) [1-4].

Isolated lesions of the nerve are rare, with only six cases described, and one case documented with the nerve conduction on a 25 year old woman with a lesion after intramuscular injection [5].

The aim of this study was to access the posterior cutaneous femoral nerve and compare our data with pre-existing international literature and propose standardization for the nerve.

Materials and Methods

One hundred and sixteen limbs from fifty-eight healthy volunteers were evaluated using Dumitru et al. [1] technique (Figure 1). In this technique the recording site consists in placing the active surface electrode in the midline of the posterior thigh, 6 cm proximal to the midpopliteal region. The reference electrode is placed 3 cm distally. The stimulation site consists in placing the surface electrode 12 cm proximal to the recording electrode on a line connecting the active recording electrode with the ischial tuberosity in the groove between the medial and lateral hamstring muscles. This intermuscular groove is confirmed by palpating the posterior thigh while asking the patient to flex the knee slightly [6]. The latency was measured from the stimulus onset to the onset of the SNAP. The amplitude was measured from the negative peak to the baseline.

Figure

Figure 1

Results

The mean values for the posterior cutaneous femoral nerve were as follows: onset latency 2.0msec (±0.5), amplitude 7.0µV (±2,1), nerve conduction velocity 52 m/s (±4); Table 1 summarizes our findings.

Figure

Table 1

Conclusion

The assessment of the posterior femoral cutaneous nerve is simple and reproducible and can provide auxiliary information on the proximal sensory inervation of the lower limbs, including the perineal region. The results of this standardization were similar to the ones described in international literature.

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