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
Katona Twins Katona Twins The Katona Twins are a celebrated Hungarian guitar duo, comprising Péter and Zoltán Katona, identical twins. They have performed at prestigious venues and at major music festivals around the world. Their performances and recordings have been widely reviewed by the music press and they have been described as "the classical world's best-known guitar duo". The Katonas' repertoire includes Classical music, Tango and Spanish guitar. They have also adapted and arranged classical works for guitar duo. Their five album releases to date have included works by Handel, Scarlatti, Isaac Albéniz and Ástor Piazzolla. They also perform works by de