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
Brewer twins the World" by "People" magazine in 1998. They have worked with photographers such as Bruce Weber, Steven Meisel, Tiziano Magni, Claus Wickwrath, Randall Mesdon, Marko Realmonte and also with model Cindy Crawford. They have appeared on the covers of "Glamour", "Esquire", "Mizz", "Sassy", "Dolly", "Student Life", "Vogue", "Fortune" amongst others., They are also amateur surfers and snowboarders. In 2003 they moved in the insurance business and opened their own insurance agency in 2013 in Redondo Beach, CA. Brewer twins Derek and Keith Brewer, known as the Brewer Twins, are male models. The twins were born on September 21, 1973, at