part_of part of part of trophoblast cytotrophoblast http://upload.wikimedia.org/wikipedia/commons/d/df/Gray36.png NCIT:C33919 Wikipedia:Cytotrophoblast cytotrophoblastic cell layer FMA:83039 cellular trophoblast UBERON:0000319 VHOG:0000683 EHDAA:89 cytotrophoblastic cell Langhans' layer EMAPA:16067 EHDAA:152 todo - unify with EHDAA2, which distinguishes multiple types of cytotrophoblast cytotrophoblastus BTO:0000322 The inner layer of the trophoblast, interior to the syncytiotrophoblast in an embryo. It serves to anchor the embryonic chorion to the maternal endometrium. Cytotrophoblasts are stem cells in the chorionic villi. During differentiation, mononuclear cytotrophoblast fuse together into the multinucleated syncytiotrophoblasts. The primary villi has only the cytotrophoblast as an axe. [WP,unvetted]. A derivative layer of the trophoblast, the cells of which retain their boundaries and contribute to the extraembryonic mesoderm [Evolution, Fourth_Edition_(2006)_McGraw-Hill, Function, Vertebrates:_Comparative_Anatomy, p.189, see_Kardong_KV][VHOG] SCTID:308841008 EHDAA:127 UMLS:C0230960 layer of Langhans embryonic structure chorionic villus