part of part of develops from develops from attached to attached to system male reproductive system mesoderm-derived structure remnant of embryonic structure tunica vaginalis testis appendix testis http://upload.wikimedia.org/wikipedia/commons/4/4d/Gray1148.png The appendix testis is a vestigial remnant of the Mullerian duct, present on the upper pole of the testis and attached to the tunica vaginalis. It is present about 90% of the time. appendices testis a cystlike remnant of the müllerian duct on the upper end of the testis; corresponding female structure: one of the small pedunculated structures attached to the uterine tubes near their fimbriated end; remnants of the mesonephric ducts[http://medical-dictionary.thefreedictionary.com/]. hydatid of morgagni See also 'vesicular appendage of epoophoron'. TODO: check vesicular appendages the label hydatid of morgagni is ambiguous w.r.t male vs female. The ncita structure 'hydatic of morgani' is male and thus belongs here. FMA:19846 appendix vesiculosus appendix of the testis UMLS:C1512521 hydatid of Morgagni NCIT:C32747 testis appendix SCTID:279601003 UBERON:0006651 hydatid of Morgani appendix testis EMAPA:29304 MA:0003246 appendix of testis EMAPA:19087 Wikipedia:Appendix_of_testis male paramesonephric duct