Explain how siomese twins form

please help

http://en.wikipedia.org/wiki/Conjoined_twins

thank you

You're welcome.

Siamese twins, also known as conjoined twins, form when a single fertilized egg (zygote) fails to separate completely during early embryonic development. This incomplete separation occurs when the zygote splits partially but not fully into two distinct embryos. As a result, the developing embryos remain physically connected and share certain organs or body parts.

The exact cause of conjoined twinning is not well understood, but it is believed to be a combination of genetic and environmental factors. It is a rare occurrence, happening approximately once in every 50,000 to 200,000 live births.

To understand how Siamese twins form more deeply, it helps to know about the normal process of embryonic development. After fertilization, the zygote undergoes cell division and differentiation over several weeks, forming a cluster of cells called the blastocyst. The blastocyst then implants into the mother's uterus and continues to develop.

In typical twinning, the blastocyst splits into two separate embryos during the first two weeks of gestation. This process is thought to occur due to genetic factors that influence cell division patterns. Each embryo then develops its own separate amniotic sac and placenta.

However, in the case of conjoined twinning, the blastocyst partially splits, leading to incomplete separation of the embryos. The extent and location of the connection between the twins can vary greatly depending on which part of the division process was affected. As a result, Siamese twins may share various organs or body structures, such as the liver, heart, gastrointestinal tract, or limbs.

It is important to note that being born as Siamese twins does not imply any specific medical conditions or health issues. The outcomes and separability of Siamese twins depend on several factors, including the location and extent of the connection, the shared organs, and the overall health of the twins. In some cases, separation surgery may be an option, but it is a complex procedure with potential risks and ethical considerations. Medical professionals in specialized centers assess each case individually to determine the best course of action.