In the blastocyst, the cells that develop into the embryo are the 23:25 Biology In the blastocyst, the cells that develop into the embryo are the a. blastocele cells. b. chorionic villi cells. c. cytotrophoblast cells. d. inner cell mass. e. syncytiotrophoblast cells. Answer: d Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+