The significant difference between embryo and fetus indicates that the embryo is the word that explains the growth of a young offspring in mommy’s womb beginning from the day of fertilization and ending on the 8th week of gestation. In contrast, the fetus is the word that explains the embryo from the 8th week till the offspring is delivered. Fertilization is described as the procedure where an egg cell connects with a sperm cell to create a diploid zygote at the time of sexual reproduction. Accordingly, the growth of an immature offspring occurs from the day of fertilization until the day of delivery inside the mommy’s womb. Upon creation of the zygote, it goes through various phases in the cell department. Similarly, the embryo and fetus are two phases of the pregnancy.
What is Embryo?
The embryo is the initial phase of growth of the zygote. The zygote is known as the diploid cell in which the egg connects with a sperm. After that, the fertilized egg experiences immediate cell unit procedure during the first stage of embryonic growth. Here, the embryo’s cells reproduce and distinguish between taking on different operations. Also, there are three primary phases in embryonic development which have to do with the gastrula, blastula, and organogenesis phase. Blastocoels create and cover up with a sheet of cells described as blastomeres at the blastula phase. On the contrary, units and migration of cells take place at the time of the gastrula phase. Lastly, during the organogenesis phase, the inner organs begin to grow via a sequence of processes. On the fifth week of growth, a heartbeat is exhibited. During this growth phase, a neural tube is created and formulated into the brain and spinal cord. Also, the embryonic phase is crucial since growing offspring is inclined to hazards that could form congenital disabilities.
What is Fetus?
A fetus is a phrase that explains the embryo’s growth from the ninth week of fertilization until the birth of the baby. During this time of development, the embryo acquires a more human shape. The primary body organs, which include the liver, brain, and kidneys, are available in the fetal phase. However, these organs are not completely formed or in their proper anatomical areas. The extent of the head of the fetus is more significant when compared to the body. The fetus is always 30mm long from the head to the rump. The head acquires half of the size of the fetal body. During this phase, the fetus’s weight is about 08g. The lungs begin to form, and the brain, feet, hands, and other organs have little function. Furthermore, during this phase, the superficial genitalia are available and apparent to the ultrasound. At the time of the later phases of fetal growth, the extent of the head becomes proportional to the extent of the body. Also, the development of the organs immediately takes place during this time. The development relies on the placental blood flow, a gap in the uterine cavity, and the maternal nutritional level.
Difference Between Embryo and Fetus
- The embryo is described as the initial phase of growth of the zygote till its 8th week of fertilization. In contrast, the fetus is the embryonic growth from the 8th week of fertilization until the fetus is delivered.
- The embryo has to do with three primary phases, which include the blastula, gastrula, and organogenesis phase, while there is no such phase in the fetus’s growth.
- At the time of the embryonic phase, organ growth is applied. In contrast, at the end of the fetal phase, all body organs get formed and will be available in their proper anatomical areas.