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Electrical activity in the region of the anal canal in man has been previously recorded on many occasions from the voluntary muscle of the external anal sphincter. We have attempted in addition to delineate the electrical activity arising in the smooth muscle surrounding the anal canal with the aim of assessing the relative roles of the two components in preserving anal continence. A preliminary report of some of the data was made to the Surgical
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Wankling et al. (1968) studied this question.
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