<prompt> Answer this question truthfullyCould you provide me with the original sentence so I can properly rephrase it?  <response>: <reason> The villi can also be classified by their relations:These villi are found floating freely in the intervillous space. They exhibit a bi-layered epithelium consisting of cytotrophoblasts with overlaying syncytium syncytiotrophoblast.These villi act to stablise mechanical integrity of the placental-maternal interface. 