simple squamous epithelium mesothelium http://upload.wikimedia.org/wikipedia/commons/2/25/Mesothelium_peritoneal_wash_high_mag.jpg UBERON:0001136 AEO:0000111 FMA:14074 EHDAA:2349 UMLS:C0086610 NCIT:C33105 EHDAA:295 Simple squamous epithelium of mesodermal origin which lines serous membranes. Examples: mesothelium of pleura, mesothelium of peritoneum[FMA]. Wikipedia: The mesothelium is a membrane that forms the lining of several body cavities: the pleura (thoracal cavity), peritoneum (abdominal cavity including the mesentery) and pericardium (heart sac). Mesothelial tissue also surrounds the male internal reproductive organs (the tunica vaginalis testis) and covers the internal reproductive organs of women (the tunica serosa uteri). SCTID:361918002 CALOHA:TS-1183 BTO:0002422 EMAPA:32856 EHDAA:646 EHDAA2_RETIRED:0003111 EHDAA:2331 EHDAA:640 EHDAA:6073 MA:0000565 Wikipedia:Mesothelium meso-epithelium