👉 The term "blastocoel" is a medical term used to describe a type of embryonic organ or tissue in mammals, which plays an important role in the development and function of the lining of the uterus during pregnancy. The blastocoel is located at the base of the uterus and is responsible for the formation of the uterine lining during pregnancy. The blastocoel consists of a specialized layer of epithelial cells called the blastocellular layer that lines the inner side of the uterus.