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