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Neurophysiological evaluation of central-peripheral sensory and motor pudendal fibres

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Abstract

Extensive neurophysiological investigations were carried out in 18 healthy volunteer subjects, and 6 patients with neurological disease. The tests consisted of spinal and scalp somatosensory evoked potentials (SEPs) to stimulation of the dorsal nerve of penis/clitoris, motor evoked potentials (MEPs) from the bulbocavernosus muscle (BC) and anal sphincter (AS) in response to scalp and sacral root stimulation, and measurement of sacral reflex latency (SRL) from BC and AS.

In the control subjects, the mean sensory total conduction time (sensory TCT), as measured at the peak of the scalp P40 wave was 40.9 msec (range: 37.8–44.2). The mean sensory central conduction time (sensory CCT = spine-to-scalp conduction time) was 27.0 msec (range: 23.5–30.4).

Transcranial brain stimulation was performed by using a magnetic stimulator both at rest and during voluntary contraction of the examined muscle. Sacral root stimulation was performed at rest. Motor total conduction times (motor TCT) to BC and AS muscles were respectively 28.8 and 30.0 msec at rest, and 22.5 and 22.8 msec during contraction. Motor central conduction times (motor CCT) to sacral cord segments controlling BC and AS muscles were respectively 22.4 and 21.2 msec at rest, and 15.1 and 12.4 msec during contraction.

The mean latencies of SRL were respectively 31.4 msec in the bulbocavernosus muscle and 35.9 msec in the anal sphincter. Combined or isolated abnormalities of SEPs, MEPs and SRL were found in a small group of patients with neurological disorders primarily or secondarily affecting the genito-urinary tract.

References (47)

  • M. Schieppati et al.

    Effects of stimulus intensity, cervical cord tractotomies and cerebellectomy on somatosensory evoked potentials from skin and muscle afferents of cat hind limb

    Electroenceph. clin. Neurophysiol.

    (1981)
  • M.B. Siroky et al.

    Sacral signal tracing: the electrophysiology of the bulbocavernosus reflex

    J. Urol.

    (1979)
  • J.T. Andersen et al.

    Electrophysiological techniques for the study of urethral and vesical innervation

    Scand. J. Urol. Nephrol.

    (1976)
  • M.D. Caramia et al.

    Electriv vs. magnetic transcranial stimulation of the brain in healthy humans: a comparative study of central motor tracts ‘conductivity’ and ‘excitability’

    Brain Res.

    (1989)
  • A. Chantraine et al.

    Motor conduction velocity in the internal pudendal nerves

  • G.D. Dawson

    Cerebral responses to electrical stimulation of peripheral nerve in man

    J. Neurol. Neurosurg. Psychiat.

    (1947)
  • J.E. Desmedt

    Size principle of motoneuron recruitment and the calibration of muscle force and speed in man

  • J.E. Desmedt et al.

    Average cerebral evoked potentials in evaluation of lesions of sensory nerve and of central somatosensory pathways

  • E.V. Evarts

    Motor cortex output in primates

  • T.C. Gerstenberg et al.

    Pudendal somatosensory, urethral and bladder wall evoked potentials in normals

  • S. Haldeman

    Pudendal nerve evoked spinal, cortical and bulbocavernosus reflex response: methods and applications

  • E. Henneman et al.

    Excitability and inhibitability of motor neurons of different sizes

    J. Neurophysiol.

    (1965)
  • A.M. Lassek

    The human pyramidal tract. II. A numerical investigation of the Betz cells of the motor area

    Arch. Neurol. Psychiat.

    (1940)

    • Cited by (0)

    1

    Supported by a grant from the ‘Fondation Saint-Luc,’ Université Catholique de Louvain, B-1200 Brussels, Belgium.

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