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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.28 no.2 São Paulo June 1970

https://doi.org/10.1590/S0004-282X1970000200003 

Nerve conduction patterns determined electronically for analysing peripheral nerves behavior in vivo

 

Padrões de condução de impulsos nervosos, determinados eletronicamente, para análise de comportamento de nervos "in vivo"

 

 

Eros Abrantes ErhartI; José FurlaniIII; Antonio Carlos BerardiII; Fausto BérzinIV; Walter BiazottoIV

IDepartamento de Anatomia da Universidade de São Paulo (Prof. O. Machado de Sousa): Professor Adjunto, Chefe da Secção de Neuranatomia
IIDepartamento de Anatomia da Universidade de São Paulo (Prof. O. Machado de Sousa): Técnico em eletrônica
IIIDepartamento de Anatomia da Universidade de São Paulo (Prof. O. Machado de Sousa): Assistente
IVDepartamento de Anatomia da Universidade de São Paulo (Prof. O. Machado de Sousa): Instrutor

 

 


SUMMARY

Nerve conduction patterns of the ulnar, hypoglossal and medial brachial cutaneous nerves were determined and recorded electronically in vivo on anesthetized dogs. The recorded tracings obtained were generally found to be in accordance with those described in the literature. However, our tracings showed a new additional fact, i.e., that motor and sensory peripheral nerve fibers have a specific unidirectional conduction (centrifugally for motor and centripetally for sensory), as long as these nerves were maintained undisturbed in their natural connective tissue bed. Although these facts correspond to what is considered normal biological behavior of nerve fibers, when in their natural environment, as far as we know, this has not been demonstrated before in neurophysiological experiments.


RESUMO

Padrões de condução de impulsos nervosos foram determinados eletrônicamente, in vivo, nos nervos ulnar (13), hipoglosso (16) e cutâneo medial do braço (7) de cães anestesiados. Os traçados obtidos confirmaram, em linhas gerais, os descritos na literatura. Todavia, demonstraram um fato novo, adicional, isto é, que fibras motoras e sensitivas, integrantes de nervos periféricos, apresentam uma condução específica, unidirecional (centrífuga nas fibras motoras e centrípeta nas sensitivas), desde que mantidas praticamente intactas em seus respectivos leitos conectivos naturais. Embora este tipo de condução específica corresponda ao que se admite e aceita como comportamento normal, biológico, dessas fibras nervosas, e constitua ainda, base do exame neurológico, esta evidência nunca foi demonstrada anteriormente em experiências e preparações neurofisiológicas.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

REFERENCES

1. BOWMAN, J. & COMBS, C. M. — Discharge patterns of lingual spindle afferent fibers in the hypoglossal nerve of the Rhesus monkey. Exptl. Neurol. 21:105, 1968.         [ Links ]

2. BURGESS, P. R. & PERL, E. R. — Myelinated afferent fibers responding specifically to noxious stimulation of the skin. J. Physiol. (London) 190:541, 1967.         [ Links ]

3. ERHART, E. A. — Normal nerve-fibres in the distal segment of nerves completely separated from the proximal stump for more than six months. Arq. Neuro-Psiquiat. (São Paulo) 20:289, 1962.         [ Links ]

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5. ERHART, E. A. & REZZE, C. J. — Nerve fibres in isolated segments of dog ulnar nerve after complete brachial plexotomy and periaxilar artery sympathectomy. Arq. Neuro-Psiquiat. (São Paulo) 23:82, 1965.         [ Links ]

6. ERHART, E. A. & REZZE, C. J. — The neuroma-like structure of the longtime severed and isolated nerve stumps. Arq. Neuro-Psiquiat. (São Paulo) 23:91, 1965.         [ Links ]

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Departamento de Anatomia — Faculdade de Medicina da Universidade de São Paulo — Caixa Postal 2921 — São Paulo, SP — Brasil.
Trabalho desenvolvido graças auxílio da Fundação de Amparo à Pesquisa do Estado de São Paulo (Proc. 68/475)

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