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According to this paper (full text freely available), "the somatic pudendal nerve stimulates striated muscle of the external urethral sphincter, mediated by ACh activating nicotinic (N) receptors" (from Figure 2 caption). And here is Figure 2 from that paper: On page 83 of the paper the Guarding Reflex - which is the bladder-to-external urethral ...

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