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|Primary urethral groove|
|Latin||sulcus urethralis primarius|
|Gives rise to||urethra|
The primary urethral groove or urethral groove is a temporary linear indentation on the underside (ventral side) of the male penis during embryonic development.
In humans, it typically appears around 8 weeks of gestation and becomes closed into a normal male urethra by the 12th week.
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