The precursor of the urethra [ http://orcid.org/0000-0002-6601-2165 ]
Synonyms: urethral groove sulcus urethralis primarius urethral sulcus
Term information
In humans, the urethral groove is a temporary linear indentation on the underside (ventral side) of the male penis during embryonic development. It typically appears around 8 weeks of gestation and becomes closed into a normal male urethra by the 12th week