What are the stages of development of a fetus?
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Which comes first morula or blastocyst?
In humans, the blastocyst is formed approximatelyy five days after fertilization. This stage is preceded by the morula. The morula is a solid ball of about 16 undifferentiated, spherical cells.
What is a zygote morula and blastocyst?
A morula, if untouched and allowed to remain implanted, will eventually develop into a blastocyst. The morula is produced by a series of cleavage divisions of the early embryo, starting with the single-celled zygote (cytula).
What are the 6 stages of embryonic development in order?
1.1 Fertilization.
Which is correct Foetus or fetus?
Indeed the spelling fetus is the etymologically correct one as it derives from the Latin term ‘fetus’ meaning “offspring”. The foetus usage is derived from the erroneous belief that the spelling fetus was an Americanism for which an original ‘o’ had been dropped.
What is the difference between a zygote blastocyst embryo and fetus?
When meet, a zygote is formed and quickly begins dividing to become an embryo. As pregnancy progresses the embryo becomes a fetus. The fetus becomes a neonate or newborn at birth.
Is a blastocyst a zygote?
The fertilized egg (zygote) divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst.
Is zygote an embryo?
In general, the zygote is the stage that is succeeded by an embryo. The word Zygote is derived from the Greek word ‘zygotos’ which refer to yoked. The word Embryo is derived from a Latin word ’embryum’ which refer to grows. The mitosis of the zygote results in the formation of the embryo.