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
Carlson Twins Carlson Twins Kyle and Lane Carlson (born December 24, 1978) are identical twin brothers known as the Carlson Twins. The Carlson twins work together as male fashion models. The twins were born in Stillwater, Minnesota, United States, Kyle six minutes after Lane. The Carlson twins grew up with two older siblings, Aaron and Michelle, and a younger sister, Lynnaya. Their mother Judy was a nursing assistant and their father Rick owned a construction company. The brothers attended Stillwater High School and both graduated from Winona State University, majoring in business. Kyle married model Jessica Hall in 2008, and they had