HISTOLOGY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -In terms of urinary function, the parasympathetic nerves stimulate the detrusor to contract. Immediately preceding parasympathetic stimulation, the sympathetic influence on the internal urethral sphincter becomes suppressed so that the internal sphincter relaxes and opens.
Detailed explanation-2: -Thus, urination results from the coordinated activity of sacral parasympathetic neurons and temporary inactivity of the -motor neurons of the voluntary motor system.
Detailed explanation-3: -Function. During urination, the detrusor muscle is contracted via parasympathetic branches from the pelvic splanchnic nerves to empty the bladder. At other times, the muscle is kept relaxed via sympathetic branches from the inferior hypogastric plexus to allow the bladder to fill.