Here are some...: For adults, at rest, the diameter of urethral opening is 0 mm since it is closed; at voiding, its diameter is about 4-8 mm since it opens up but with various degree to reflect its dynamic functionality to relax and open. Besides, its configuration may wide vary among individual so at times an inexperienced eyes may fail to identify it accurately. If in doubt, have doctors take a look and answer Q.
Answered 6/10/2021
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