Fusion Theory: The Cause of Conjoined Twins Explained
A widely accepted explanation for the occurrence of conjoined twins is the fusion theory. According to this theory, conjoined twins are the result of a process known as early fission, where two separate embryos share either a yolk sac or an amniotic cavity. Over time, as these embryos grow, they come into contact with each other and eventually fuse together.
The presence of two umbilical cords in some conjoined twins provides evidence in support of the fusion theory. This suggests that these embryos were once separate entities before merging into a single entity.
Crowding Theory: How Conjoined Twins Develop
The crowding theory is a fascinating explanation for the development of conjoined twins, with its origins tracing back to the 1860s. According to this theory, conjoined twins are believed to occur due to overcrowding and duplication within a single embryonic cell mass. This overcrowding leads to the formation of bilateral structures, resulting in the conjoined twins’ physical connection. Additionally, the way conjoined twins are joined together is thought to be influenced by the distance between their respective centers of development.