filling internal urethral orifice
Definition: the internal urethral orifice after the bladder begins to be distended by urine, when the trigonal muscles are contracted and the detrusor muscle is relaxed; during this stage the orifice occurs at a higher level and is bounded by a different portion of the mucosa than during voiding.
Synonym(s): ostium urethrae internum accipiensTA
See Also: voiding internal urethral orifice
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