The urethral striated sphincter in adult male rat

Anatomy and Embryology
Anne-Sophie Biérinx, Alain Sebille

Abstract

This study reports the morphology of the urethral sphincter in adult male rats, mainly the histological aspects, the features of the endplates, and the heavy myosin chain distribution in the striated fibres. First, the prostate is entirely out of the striated sphincter, which is surprising when compared to man. Second, the urethral striated sphincter consists of two lateral fascicles separated by an anterior and a posterior strip of connective tissue, which extend from the prostatic urethra (i.e. the part of the urethra which runs though the prostate) to the bulb of the penis. An additional third fascicle of striated muscle (SM) covers the caudal part of the anterior connective strip of the membranous urethra (i.e. the urethra which extends from its prostatic part to the bulb of the penis). In the membranous urethra, the striated sphincter surrounds directly the urethral lumen without intercalated smooth muscle. In urethral cross sections, the endplates detected by alpha-bungarotoxin, which binds to nicotinic receptors, are clustered in the postero-lateral part of the lateral fascicles. The cross-sectional area of the urethral striated fibres shows a bimodal distribution: the largest fibres are located at the periphery of the s...Continue Reading

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Citations

Jun 11, 2008·BJU International·Orietta DalpiazHannes Strasser
Aug 8, 2015·Neurourology and Urodynamics·Raúl JuárezYolanda Cruz
Mar 27, 2012·Neurourology and Urodynamics·Margarita JuárezYolanda Cruz
Jul 9, 2013·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Seh Hong LimChen-Li Cheng
Nov 2, 2013·World Journal of Stem Cells·Hatim Thaker, Arun K Sharma
Jul 2, 2017·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Toshiko Tsumori, Wakako Tsumiyama
Oct 23, 2018·Biology of Sex Differences·Benjamin AbelsonMargot S Damaser

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