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PubMed · 8168421

Anorectal function.

O O Rasmussen
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Abstract

A review in a historic perspective of the present knowledge of anorectal physiology is presented. The techniques used in the anorectal physiology laboratory are discussed. Application of new sophisticated techniques to anorectal physiology research in recent years continue to improve our knowledge of anorectal function. Anal continence and defecation depend on both the anal sphincter and the rectum. The assessment of patients with functional anorectal diseases should include a more complete physiologic evaluation of the anorectum than used previously.

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Anal CanalDefecationElectromyographyHumansManometryMusclesPressureRectumJournal ArticleReview

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O O Rasmussen. 1994. Anorectal function.. https://doi.org/10.1007/bf02053604

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The intrinsic recto-anal inhibitory reflex (RAIR) and the extrinsic vesico-anal excitatory reflex were studied in anaesthetized cats in order to explore the nervous components of anal pressure regulation. The magnitude of the RAIR was documented at varying levels of anal pressure. Minimal anal pressure during RAIR was positively correlated to anal pressure immediately prior to rectal distension. It was possible to elicit the vesico-anal excitatory reflex concomitantly with an ongoing RAIR. It was also possible to elicit a RAIR during the vesico-anal excitatory reflex. The magnitude of the pressor reflex response was not changed by concomitant activation of the inhibitory reflex and vice versa. This suggests an independent action on the internal anal sphincter (IAS) of the two reflexes. Spontaneous detrusor contractions were abolished by rectal distension. However, an escape phenomenon from this inhibition was observed, suggesting a spinal, associative, connection. The results support the concept of a direct action of both extrinsic and intrinsic nervous mechanisms on the smooth muscle of the IAS.

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