part of develops from embryonic structure genitourinary system urogenital fold gonadal ridge gonadal ridge indifferent gonadal ridge EMAPA:35899 BTO:0001402 EFO:0001414 SCTID:308801004 crista gonadalis genital ridge AAO:0011047 EHDAA2:0004044 SCTID:361399001 NCIT:C34321 Wikipedia:Gonadal_ridge XAO:0000018 The elevation of thickened mesothelium and underlying mesenchyme found on the ventromedial border of the embryonic mesonephros in which the primordial germ cells become embedded, establishing it as the primordium of the testis or ovary. NCIT:C34184 genital cord FMA:321917