endometrium Animals that have estrous cycles reabsorb the endometrium if conception does not occur during that cycle. Animals that have menstrual cycles shed the endometrium through menstruation instead BTO:0001422 CALOHA:TS-0276 EFO:0000980 EMAPA:29917 EV:0100115 FMA:17742 GAID:377 MA:0000390 MAT:0000319 MESH:A05.360.319.679.490 MIAA:0000319 The maternal part of the placenta (of eutherian mammals) is the vascularized and glandular uterine lining, or endometrium.[well established][VHOG] The mucous membrane lining the uterus. [TFD][VHOG] UBERON:0001295 UMLS:C0014180 VHOG:0001285 endometrial in FMA this is subdivided into basal and outer the glandular mucous membrane lining of the uterine cavity that is hormonally responsive during the estrous/menstrual cycle and during pregnancy tunica mucosa (endometrium) tunica mucosa uteri uberon uterine endometrium uterine mucosa uterine mucous membrane reproductive system mucosa