The embryo grows rapidly, and the baby’s external features begin to form . Your baby’s brain, spinal cord, and heart begin to develop. Baby’s gastrointestinal tract starts to form. It is during this time in the first trimester that the baby is most at risk for damage from things that may cause birth defects.
What are the major developmental changes that occur in the embryo during the first trimester?
The baby’s brain and spinal cord will develop from the neural tube . The heart and other organs also are starting to form and the heart begins to beat. Structures necessary to the formation of the eyes and ears develop. Small buds appear that will soon become arms.
What is the development of an embryo?
In developmental biology, embryonic development, also known as embryogenesis, is the development of an animal or plant embryo . Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell, (spermatozoon). Once fertilized, the ovum becomes a single diploid cell known as a zygote.
What happens during the embryo stage of development?
Starting in the second week after fertilization, the embryo starts to develop distinct cell layers, form the nervous system, make blood cells, and form many organs . By the end of the embryonic stage, most organs have started to form, although they will continue to develop and grow in the next stage (that of the fetus).
What are some major changes to the embryo during pregnancy?
The embryo looks like a tadpole. The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form. The beginnings of the eyes and ears are developing . Tiny limb buds appear, which will develop into arms and legs.
What week is most critical in pregnancy?
In general, major defects of the body and internal organs are more likely to occur between 3 to 12 embryo / fetal weeks . This is the same as 5 to 14 gestational weeks (weeks since the first day of your last period). This is also referred to as the first trimester.
Do and don’ts in 1st month of pregnancy?
Eat a variety of healthy food that is rich in iron, calcium and folate . Small frequent meals at regular intervals, along with an adequate liquid intake, are essential during the first trimester. Drink at least eight glasses (1.5 litres) of fluid every day, mostly water. It’s very important to stay hydrated.
What is the first organ to develop in the embryo?
The heart is the first organ to form during development of the body. When an embryo is made up of only a very few cells, each cell can get the nutrients it needs directly from its surroundings.
Which side of the uterus does the baby grow?
According to the theory, the placement of your developing placenta – which must be determined in a very precise way – can reveal your baby’s sex. If your placenta is forming on the right side of your uterus, the baby is most likely a boy, the theory claims. If it’s forming on the left side, it’s probably a girl .
How do you feel your uterus in early pregnancy?
Walk your fingers up the side of her abdomen (Figure 10.1) until you feel the top of her abdomen under the skin. It will feel like a hard ball. You can feel the top by curving your fingers gently into the abdomen. Figure 10.1 With the woman lying on her back, begin by finding the top of the uterus with your fingers.
Is an embryo a baby?
An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.
What are the 5 stages of embryonic development?
- Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa). ...
- Blastocyst Development. ...
- Blastocyst Implantation. ...
- Embryo Development. ...
- Fetal Development.
What are the four stages of embryonic development?
- Germinal stage. 1.1 Fertilization. 1.2 Cleavage. 1.3 Blastulation. 1.4 Implantation. 1.5 Embryonic disc.
- Gastrulation.
- Neurulation.
- Development of organs and organ systems.
What are the main events occurring in the embryo?
Three major events occur during the embryonic stage: implantation, the division of germ layers, and organogenesis . Implantation is the burrowing of the embryo, which at this point is really just a ball of ever-splitting cells, into the mother’s uterus.
What are the developmental stages?
There are three broad stages of development: early childhood, middle childhood, and adolescence . They are defined by the primary tasks of development in each stage.
What is the embryonic stage of pregnancy?
After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy . During this stage, the baby is called an embryo. There are numerous changes that occur during the embryonic stage.
