Abstract
SUMMARY: Description of right and left lateral muscle bands which, together with the trigonal muscle, comprise a muscular system that opens up the bladder neck in the act of micturition. These three muscles constitute the internal muscles of the bladder neck. Description of additional features in the musculature of this region. Cystoscopic description of movement at the bladder neck and in the posterior urethra during the act of micturition in patients— With normal bladder. With fibrotic bladder neck contracture. With adenomatous enlargement of the prostate. Interpretation of part played by the various muscular components in the act of micturition in both normal and abnormal conditions.

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