part of part of develops from develops from contributes to morphology of uterine wall extraembryonic structure placenta decidua http://upload.wikimedia.org/wikipedia/commons/f/fa/Gray33.png Wikipedia:Decidua NCIT:C32425 UMLS:C0011106 GAID:378 formed under the influence of progesterone and forms highly-characteristic cells. [Wikipedia:Decidua] SCTID:362842004 MAT:0000290 UBERON:0002450 MIAA:0000290 decidous membrane FMA:85538 extraembryonic placenta MESH:D003656 BTO:0001360 The maternal uterine-derived portion of the placenta. maternal part of placenta maternal placenta extraembryonic part of placenta CALOHA:TS-0193 MA:0001722 endometrium EMAPA:35269 uterine decidua maternal decidual layer decidua basalis placenta maternal decidual layer TODO - check mp syn