PREEMBRYO; The true meaning.
The term “preembryo” refers to the unborn’s stage of development during the first 14 days after fertilization. After that, it is called an embryo until the end of the eighth week. From then on, it is called a fetus. Why is the word “preembryo” used?
The term was used as the rationale for permitting human embryo research during the first 14 days after conception. One reference work says: “if one defines the embryo as the structure destined to become the baby, its earliest rudiments do not form until about two weeks after the sperm meets the egg.” But can this preembryo be dismissed as a mere mass of cells, fit for little more than research? Considered what really happens during this two-week period.
After the sperm has penetrated the egg, it takes about 24 hours for male and female chromosomes to fuse. During the next few days, the cell divides. Within four or five days after fertilization, the cluster of cells develops into a hollow sphere (still smaller than a pin-head) with an outer cell layer and an inner cell mass. It is now known as a blastocyst. Many of the cells of the outer layer will develop into non-embryonic tissues. From the inner cell mass, however, the baby itself will develop.
About a week after fertilization, implantation in the womb occurs. The blastocyst attaches itself to the womb and begins the construction of the placenta, which will allow the passage of oxygen and food from the mother’s bloodstream and the release of wastes. According to the book incredible voyage-exploring the human body, by about day nine the inner cell mass starts “the task of constructing a new human being.” It adds: “those 20 or so cells must perform a series of restructurings and differentiations over another five or six days to create the first structural element of the actual embryo.” So by the end of the second week, this “first structural element,” from which the central nervous system eventually develops, begins to appear.
Because of this preparatory step-by-step process that goes on within the early human embryo, some argue that “there is no one biological event or moment that can be considered the start of a new human embryo.” True Christians, however, believe that life begins at conception. The fact that the original fertilized cell contains the program for the construction of the placenta, the implantation, the connections with the mother’s blood vessel is divinely designed by the creator.