anal sphincter

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Noun1.anal sphincter - the sphincter muscle of the anus
anus - the excretory opening at the end of the alimentary canal
anatomical sphincter, sphincter, sphincter muscle - a ring of muscle that contracts to close an opening
musculus sphincter ani externus - an external ring of striated muscle surrounding the anus
musculus sphincter ani internus - an internal ring of smooth muscle formed by circular fibers of the rectum
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References in periodicals archive ?
Third-degree tears involve the muscular ring (anal sphincter) that helps to control bowel movement while in fourth-degree tears, the perineal muscle, the anal sphincter and/or rectum is also damaged.
The rate of primary obstetric anal sphincter injury is about 18% in vaginal deliveries (6).
As for the second case, presenting with extremely sharp upper back pain followed by paraplegia and anal sphincter impairment, we chose immediate surgical intervention with thoracic endovascular aortic repair (TEVAR), aiming at amelioration of the pressure gradient across the juxtaductal coarctation in the aorta, to ensure the safety and the completeness of following surgical decompression of the spinal epidural hematoma.
The inability to evaluate the anal sphincter complex, secondary extensions of the fistula as well as relevant anatomic compartments and musculature stand as the major drawbacks of this technique.
VAC can also be defined as a sphincter-saving procedure since the anal sphincter is left intact (3).
BoTox A has been successfully used to treat skeletal muscle spasm and high-tension diseases in adults and children, such as esophageal achalasia.[3] Langer and Birnbaum first described transabdominal ultrasound localization and anal sphincter injection of BoTox A in children with congenital megacolon causing intestinal obstruction.[4] However, this treatment is technically challenging.
The resting anal canal pressure mainly reflects the internal anal sphincter function, while the voluntary squeeze pressure predominantly reflects the external anal sphincter function.
Likewise, obstetric anal sphincter injuries are associated with short and long-term sequelae, mainly anal incontinence, rectovaginal fistulas, wound dehiscence, and abscess formation, which affect physically and psychologically patients (11,16-18).
Anatomically, in women, the perineal body separates the anal canal from the urogenital diaphragm in the median plane where the deep bulbospongiosus and superficial transverse perineal muscles meet the external anal sphincter (EAS).
Pelvic magnetic resonance imaging demonstrated a wide, solid appearing mass that involves a significant portion of the anal sphincter. The mass extended upwards from the perirectal region of the anus, coursing around the rectum with an additional lobulation.
Traditional surgical procedures; manual anal dilatation or internal lateral sphincterotomy have been commonly used to reduce the hypertonia of the internal anal sphincter but they carry risk of permanent impairment of anal continence.