Craniopagus twins conjoined twins develop inutero remains unclear. Embryologists have traditionally attributed identical twinning as "splitting or fission" of either the inner cell mass of pleuripotential cells or early embryonic disc at 13–14 days of gestation just before the primitive streak. Some theorists suggested that conjoined twins develop as a result of the failed fusion of a single fertilized ovum. However a new hypothesis suggests that cranial fusion occurs between two separate embryos before the end of the 4th week of gestation. This can happen because the cranial neuropore is still open, which is responsible for the ultimate fusion and formation of
The Dolan Twins The Dolan Twins Ethan and Grayson Dolan (born December 16, 1999), collectively known as The Dolan Twins, are an American comedy duo who rose to prominence in May 2013 on the video sharing application Vine. They are currently signed to AwesomenessTV, and have been since 2015. The twins are from the Long Valley section of Washington Township, Morris County, New Jersey. On December 19, 2017 they published a video, highlighting what type of twins they are. In the video Ethan Dolan expressed doubt that they were identical twins, in truth they are. Since their beginnings, the duo has accumulated over