Primary urethral groove

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Primary urethral groove
Precursorurogenital folds
Gives rise tourethra
Latinsulcus urethralis primarius
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.

Clinical significance[edit]

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


  1. ^ Holland AJ, Smith GH (August 2000). "Effect of the depth and width of the urethral plate on tubularized incised plate urethroplasty". J. Urol. 164 (2): 489–91. doi:10.1016/S0022-5347(05)67408-3. PMID 10893631.