part_of part of has part has_part develops from membranous layer testis mesothelium mesoderm-derived structure reproductive structure peritoneal vaginal process tunica vaginalis testis UBERON:0006650 Wikipedia:Tunica_vaginalis EMAPA:19179 testis tunica vaginalis The outer coelomic epithelial covering of the testis; a sac of serous tissue covering the testis and the epididymis within which the testis can move about; it covers the tunica albuginea. uberon SCTID:367713008 NCIT:C33822 lamina parietalis we follow FMA is classifying as membranous layer - but this does not account for relationship to mesolthelium (subclass or has part?). The FMA also has 'sac of tunica vaginalis', which is a serous sac.[FMA] tunica vaginalis of testis SCTID:362281009 FMA:15863 FMA:19844 processus vaginalis testis lamina visceralis MA:0003253 tunica vaginalis