Histochemical and contractile properties of striated muscles of urethra and levator ani of dogs and sheep

Neurourology and Urodynamics
Xinmin Chen, Kate E Creed

Abstract

To understand their possible importance in long- and short-term control of continence, some properties of the striated muscles of the urethra and pelvic floor (levator ani) of dogs and sheep were investigated, especially fiber types and contractile characteristics. Striated muscles of urethra and levator ani of 29 male and 6 female dogs and 11 male and 6 female sheep were removed and cut into strips. Some strips were frozen and stained for ATPase at pH 9.4 and 4.3 for fiber typing; others were set up in an organ bath to study contractile responses to nerve stimulation. All muscles contained both type I (slow) and type II fibers, ranging from 97% type II in female greyhound urethra to 60% in female sheep levator ani. For each muscle, there were fewer type II muscles in sheep than in dog. The diameters of the urethral fibers were about 60% of the levator ani in dogs and 34% in sheep. Contraction of the urethral muscle was faster than for levator ani and declined to about 80% of the peak, 500 msec after the beginning of stimulation at 20 Hz. The levator ani contraction rose to a steady level as long as stimulation continued. Both the levator ani and urethral striated muscles contain slow and fast fiber types. The levator ani muscl...Continue Reading

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Citations

Jun 26, 2008·International Urogynecology Journal and Pelvic Floor Dysfunction·C BetschartD Perucchini
Oct 25, 2007·International Journal of Urology : Official Journal of the Japanese Urological Association·Xavier DeffieuxGérard Amarenco
Sep 28, 2016·Neurourology and Urodynamics·Kenia López-GarcíaIsmael Jiménez-Estrada
Sep 7, 2007·Neurourology and Urodynamics·Xavier DeffieuxGérard Amarenco
Dec 22, 2005·American Journal of Physiology. Renal Physiology·Ron J JankowskiDavid A Vorp

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