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  • Title: Oscillatory potentials recorded from walls of anal canal and urethrae in dogs.
    Author: Onoe K, Tamura K, Suda S, Takahira H.
    Journal: Prog Clin Biol Res; 1990; 327():725-34. PubMed ID: 2320626.
    Abstract:
    1. Oscillatory potentials were recorded from internal anal sphincters and from internal urethral sphincters in similarity and difference in their characteristics. similarity and difference in their characteristics. 2. Unexpected finding was the appearance of burst-and-pause alternation in male urethrae in contrast to continuous oscillation in female urethrae. 3. Stimulation experiments revealed that the internal anal sphincter was controlled by reciprocal spinal outflow; lumbar accrelation and sacral inhibition. But the recto-anal reflex, constantly observable in decerebrate dogs, was predominantly inhibitory, which was identical with sacral action. 4. The effect of ventral root stimulation upon urethral oscillation was 'identical' for lumbar and for sacral activations, even if it was excitatory or inhibitory, depending upon ongoing level of activity and upon stimulus parameters. Nevertheless, reciprocal activation between detrusor spike and urethral oscillation was observed during 'isometric voiding contractions'. The reason for this inconsistency was discussed.
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