Sympathetic and Parasympathetic in Urination

It’s said that parasympathetic action contracts muscles of bladder and relax sphincters so that urination occurs. But then, why some people urinate reflexly when they fear so much?

Answer #1

Because their muscles and sphincters are really weak. That’s the same reason why a lot of women have “little accidents”.

Answer #2

In cases of overwhelming fear (e.g., imminent fear of death) the extremely high levels of norepinephrine released into the hypothalamus and amygdala release the central smooth muscle inhibition (GABA based) and the individual may uncontrollably urinate and defecate.

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