Anatomy Teiary stem villi consists of:- A Central core of cytotrophoblast covered with synctiotrophoblast B Central core of extra-embryonic mesoderm covered by central cyto- and peripheral synctio- trophoblast C Central maternal blood vessels surrounded by mesoderm and trophoblast D Central fetal blood vessels surrounded by mesoderm and trophoblast 💡 Explanation Teiary stem villi consists of:- ✓ Correct Answer: D. Central fetal blood vessels surrounded by mesoderm and trophoblast