intraembryonic การใช้

• There are two layers of mesoderm; intraembryonic and extraembryonic.
• This meant that blood vessels come from an intraembryonic source, the mesoderm.
• Mammalian embryos develop two cavities : the intraembryonic coelom and the extraembryonic coelom ( or chorionic cavity ).
• The intraembryonic coelom is lined by somatic and splanchnic lateral plate mesoderm, while the extraembryonic coelom is lined by extraembryonic mesoderm.
• The serous cavities are formed from the intraembryonic coelom and are basically an empty space within the body surrounded by serous membrane.
• The intraembryonic coelom can now be seen as a cavity within the body which is covered with serous membrane derived from the splanchnopleure.
• As the intraembryonic layer grows laterally, it becomes continuous with the extraembryonic layer, forming the chorion ( contributing to the blood supply ).
• The intraembryonic coelom is the only cavity that persists in the mammal at term, which is why its name is often contracted to simply " coelomic cavity ".
• Some ethicist and legal scholars make the argument that it is incorrect to call the conceptus an " embryo ", because it will later differentiate into both intraembryonic and extraembryonic tissues, and can even split to produce multiple embryos ( identical twins ), while others have pointed out that, as so-called extraembryonic tissues are really parts of the embryo's body that are no longer utilized after birth, much as milk teeth fall out after childhood, and as the process of the embryo splitting to form identical twins leaves the original intact, while generating a new embryo, rendering it no different from the process of cloning an adult human, these arguments against the individuality of the zygote and preimplantation embryo are invalid.