Is the Anatomy of External Anal Sphincter Fully Understood?
نویسندگان
چکیده
منابع مشابه
puborectalis and external anal sphincter muscles
The innervation of the puborectalis and external anal sphincter muscles was studied in 32 patients with idiopathic (neurogenic) faecal incontinence, 12 of whom also had complete rectal prolapse, using transcutaneous spinal stimulation, transrectal pudendal nerve stimulation, single fibre EMG, anorectal manometry, and measurement of perineal descent. Fourteen normal subjects served as controls. ...
متن کاملMagnetic resonance imaging and 3-dimensional analysis of external anal sphincter anatomy.
OBJECTIVE To use magnetic resonance images of living women and 3-dimensional modeling software to identify the component parts and characteristic features of the external anal sphincter (EAS) that have visible separation or varying origins and insertions. METHODS Detailed structural analysis of anal sphincter anatomy was performed on 3 pelvic magnetic resonance imaging (MRI) data sets selecte...
متن کاملExoanal ultrasound of the anal sphincter: normal anatomy and sphincter defects.
OBJECTIVE To describe the sonographic appearance of normal anal sphincter anatomy and sphincter defects evaluated with a conventional 5 MHz convex transducer placed on the perineum. DESIGN Prospective, single-blind study. SETTING Department of Obstetrics and Gynecology, University of Michigan Medical Center, USA. POPULATION Twenty-five women with symptoms of faecal incontinence, 11 asympt...
متن کاملContribution of the External Anal Sphincter to the Pressure Zone in the Anal Canal.
It is well known both by clinical examination and by objective measurement that a high pressure zone is to be found in the anal canal, due to the action of the anal sphincteric muscles. Division of part of the internal anal sphincter in the operation of internal sphincterotomy resulted in a diminution in this pressure zone (Bennett and Duthie, 1964). The pressure remaining after internal sphinc...
متن کاملLength-tension relationship of the external anal sphincter muscle: implications for the anal canal function.
The length at which a muscle operates in vivo (operational length) and the length at which it generates maximal force (optimal length) may be quite different. We studied active and passive length-tension characteristics of external anal sphincter (EAS) in vivo and in vitro to determine the optimal and operational length of rabbit EAS. For the in vitro studies, rings of EAS (n = 4) were prepared...
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ژورنال
عنوان ژورنال: Surgical Medicine Open Access Journal
سال: 2019
ISSN: 2578-0379
DOI: 10.31031/smoaj.2019.02.000551