voiding internal urethral orifice
the internal urethral opening when the bladder is being emptied of urine, when the trigonal muscles are relaxed and the detrusor muscle is contracting; during this stage the orifice occurs at a lower level and is bounded by a different portion of the mucosa than during filling and reserving.
Synonym(s): ostium urethrae internum evacuansTA
See Also: filling internal urethral orifice
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Examples: glitazone, GI cocktail, etc.