The order of development of fetal organs
The process of fetal development is a complex and continuous process that requires the coordination and cooperation of various organs. The fetal organ development sequence is divided into the following stages in chronological order:
The first stage: embryonic stage (fertilization-eighth week)
After the fertilized egg successfully implants, it enters the embryonic stage. At this stage, the embryo develops the primitive gut, primitive neural tube, and heart. The primitive gut is the precursor of the stomach, intestines, hepatobiliary system, and pancreas, and the primitive neural tube is the precursor of the brain and spinal cord.
During the fourth week, the heart begins to form, initially just a tiny hole that pumps blood. By the seventh week, the size of the embryo is about 1 cm, and the basic shapes of each organ have been basically formed, including the basic outlines of the liver, gallbladder, lungs, kidneys and other organs.
The second stage: mid-embryonic period (9th to 16th week)
In the middle of the embryonic period, the fetus\’s head gradually becomes more pronounced, and organs such as eyes, ears, and nose begin to form. The fetus\’s limbs have also grown by this time, and its fingers and toes have also formed.
By the ninth week, the embryo has a new name – fetus, with a body length of about 3.5 centimeters. At this time, the fetus can already flex its limbs, and the muscles around the throat have also developed.
The third stage: fetal period (seventeenth week – birth)
During the fetal period, the fetus will gradually enter a stage of rapid growth. At this time, the fetus\’s body gradually becomes more complete, and features such as teeth and nails are formed. The fetus\’s bones also become stronger and can bear a certain amount of weight.
By the twenty-fourth week, the fetus has entered a mature stage, reaching a length of more than 30 centimeters and a weight of more than 600 grams. At this time, the various organs of the fetus are basically mature, and if born, they can start to function in infancy.
4. Summary
The order of development of various organs of the fetus is very important. Each stage will affect the development of the fetus. If not paid attention to, it may lead to various serious diseases. In addition, appropriately increasing nutritional intake during pregnancy and conducting timely pregnancy checkups will help ensure the healthy development of the fetus.
