Primary urethral groove

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Primary urethral groove
Latin sulcus urethralis primarius
Precursor urogenital folds
Gives rise to urethra
Code TE E5.
Anatomical terminology

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.


Failure of complete closure can be associated with hypospadias.[1]