STAGE 1 & 2: After fertilization occurs, the zygote is produced. The zygote is what becomes the embryo. The zygote leaves the fallopian tube and enters the uterus.
As you an see in the picture above the zygote is traveling to the uterus for implantation. The process of the fertilization happens 1 day post ovulation and the zygote process occurs 1 to 3 day post ovulation. Both happen within the first trimester of pregnancy.
STAGE 4: Implantation also takes place within the first trimester and 5-6 day post ovulation. Implantation is significant because if it doesn't happen correctly then this could result in losing the baby. The placenta also begins to develop in this stage. This is very significant because this is where the fetus gets its nourishment.
pic of implantation
STAGE 6: Gastrulation begins, which is the migration of cells to the outer edges of the disc into the primitive streak and down creating a new third layer. This occurs 13 days post ovulation. The embryo now has three layers ectoderm,mesoderm,and endoderm which will develop into differently. The ectoderm will develop into skin, hair, lens of the eyes, and many more things. The mesoderm will develop into muscle, bones, lymphatic vessels, spleen, heart, and lungs. The endoderm will develop into lining of the lungs, tongue tonsils, urethra, and GI tract.
STAGE 23: I think this a significant event because this is the end of the first trimester and the embryo is now a fetus. This occurs 56 -60 days post ovulation. It looks like a baby inside the mother. The had and neck are rounded, the ears are developed externally, intestines begin to migrate from the umbilical cord into the body cavity. The limbs are developed and the fingers grow longer and the feet are not longer a tail or webbed.
STAGE (16 WEEKS) 2ND TRIMESTER: This is significant because the bone marrow begins to make blood cells. The fetus is moving around. The brain develops rapidly and continues five years after birth. Here is a 3-D picture of this stage.
STAGE (24 WEEKS AND 3RD TRIMESTER): I think this stage is significant because the fetus eyes are sensitive to light and the ears are sensitive to sound!! How cool!!! Also, the significance of this stage the blood vessels start to develop in the lungs to prepare the fetus for living outside of the uterus. Picture of another 3-D fetus at 24 weeks.
STAGE (32 WEEKS 3RD TRIMESTER): The significance of the stage is that the fetus begins to develop an immune system, which is very important!! What I think is neat is that the fetus eyes open during wake hours and close during sleep periods!! Picture of 32 weeks (7 months).
STAGE (34 WEEKS, 3RD TRIMESTER): This stage is significant because the fetus's GI system is very immature and it does not fully develop until 3-4 years after birth!! WOW! Also, they have stored fat to keep them warm.
STAGE 38 WEEKS 3RD TRIMESTER): This is significant because the liver is producing blood cells. Also the fetus is gaining weight (1/2 ounce of fat).
STAGE (WEEKS 3RD TRIMESTER): This is significant because this means the fetus has been carried full term. I think this is very important because most of the development happens within the mother. Premature babies can have a lot of complications. When the fetus is born it has 300 bones! This picture shows the 40th week and the mother should be ready to deliver any day.
Just another picture because I thought it was sooo cute!
There are so many stages of a pregnancy and it was hard choose what was more significant then others, but I think I narrowed it down.
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