[Study of the anal sphincter in children].

In dynamic study of the distal colon in children, the functional and electrophysiological methods of diagnosis developed and introduced by the authors: determination of anal reflex, electrosensitivity of the anal canal, musculocutaneous electrosensitivity, state of the genital nerve and its branches were used. The new methods of investigation permit to determine by the objective indices of the strength of the current and changes in pressure in the anal canal a state of the "sacral reflex arch" and neuromuscular apparatus of the external anal sphincter. In patients with constipation, a decrease in electrosensitivity and attenuation of reflex interconnection between the rectum and anal canal were noted.