Electromyography of the pelvic diaphragm and anal sphincter in dogs with perineal hernia.
Am J Vet Res
; 54(1): 185-90, 1993 Jan.
Article
em En
| MEDLINE
| ID: mdl-8427466
ABSTRACT
The innervation of the levator ani and coccygeal muscles and the external anal sphincter was studied by anatomic dissection in 6 clinically normal male dogs and by electrical stimulation in 5 clinically normal male dogs. Variations in innervation occasionally were found that were comparable to those reported in previous studies. Electromyographic recordings were made from the levator ani and coccygeal muscles and from the anal sphincter in 40 dogs during perineal hernia repair. Spontaneous potentials of 4 types were found in 35 dogs fibrillation potentials, positive sharp waves, complex repetitive discharges, and fasciculations. Biopsy specimens of the cranial part of the levator ani muscle were taken in 12 dogs during perineal hernia repair. Histologic examination revealed atrophy in 7 specimens. Spontaneous potentials were recorded from all muscles with histologic evidence of atrophy. All examinations of the levator ani muscle concerned the cranial part of this muscle, because the caudal part was absent in all 40 dogs. From combined results of electromyography and histologic examination, it was concluded that atrophy of the muscles of the pelvic diaphragm, which develops in some dogs with perineal hernia, is likely to be of neurogenic origin. Nerve damage is localized in the sacral plexus proximal to the muscular branches of the pudendal nerve or in the muscular branches separately.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Canal Anal
/
Pelve
/
Períneo
/
Doenças do Cão
Tipo de estudo:
Etiology_studies
Limite:
Animals
Idioma:
En
Revista:
Am J Vet Res
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Holanda