part of part of develops from develops from embryonic structure genitourinary system urogenital fold gonadal ridge http://upload.wikimedia.org/wikipedia/commons/3/30/Gray1106.png EMAPA:35899 BTO:0001402 UBERON:0005294 crista gonadalis AAO:0011047 UMLS:C1512243 Wikipedia:Gonadal_ridge TODO - check developmental relationships. merge with urogenital ridge? 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. genital cord gonadal ridge indifferent gonadal ridge EFO:0001414 SCTID:308801004 genital ridge SCTID:361399001 EHDAA2:0004044 UMLS:C0231047 NCIT:C34321 in eutherians, SRY transforms the indifferent gonad into testes XAO:0000018 NCIT:C34184 FMA:321917