What happens during the germinal stage?
The germinal stage involves several different processes that change an egg and sperm first into a zygote, and then into an embryo. The processes include fertilization, cleavage, blastulation, and implantation.
What is the germinal period of prenatal development?
The germinal period is the first 2 weeks of prenatal development after conception, which involves rapid cell division and the start of cell differentiation. First Stages of the Germinal Period. The original zygote as it divides into two cells, four cells and eight cells.
What is the stage within the germinal period development occur?
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.
When is germinal period?
The Germinal Period (Weeks 1-2) The genetic makeup and sex of the baby are set at this point. The germinal period (about 14 days in length) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus.
What happens during germinal stage of pregnancy?
The germinal period (about 14 days in length) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus. During this time, the organism begins cell division and growth. After the fourth doubling, differentiation of the cells begins to occur as well.
During which stage of prenatal development is the morula formed?
The morula stage occurs 3-4 days after fertilization, just as the early embryo enters the uterus. 2. Soon the blastocystic cavity develops inside it (fluid-filled cavity).
Why is the germinal stage important?
As the cells divide, they become more specialized, forming different organs and body parts. During the germinal stage, the cells necessary for the placenta, umbilical cord, and amniotic fluid will differentiate to form the embryo.
What marks the completion of the germinal stage?
The germinal stage ends when the blastocyst implants in the endometrium of the uterus (days 8-9). After implantation occurs, the blastocyst is called an embryo, and it will soon obtain nutrients from the mother’s blood via a temporary organ called the placenta.
What is the germinal period quizlet?
The period that begins at conception and lasts until the developing organism becomes attached to the wall of the uterus about 8 to 10 days later.
When is the morula stage?
3 – 4 days
The morula stage is a stage in the process of blastulation and occurs before the formation of the blastula. The morula occurs after 3 – 4 days of fertilization of the egg by the sperm. Hence, it is one of the important steps in the process of embryo development and the later birth of a child.
What are the four milestones of the germinal phase of prenatal development?
What is the correct order of stages of prenatal development?
There are three stages of prenatal development: the conception stage, the embryonic stage, and the fetal stage. Each stage of prenatal development is carried out over the course of approximately 40 weeks, which is the average length of most pregnancies. The conception stage is the shortest, and the fetal stage is the longest.
What are the correct sequence stages of prenatal development?
Stages of Prenatal Development Germinal Stage. The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. Embryonic Stage. At this point, the mass of cells is now known as an embryo. Fetal Stage. Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. A Word From Verywell.
What is the longest period of prenatal development?
The longest period of prenatal development is the fetal period which begins at the 9th week after conception and lasts until birth. By the 12th week, the genitals have formed. Development of all the structures of the body continues and by the end of the third month,…
What is the first phase of prenatal development?
In medical literature, prenatal development has three stages: germinal, embryonic and fetal stage. This first stage begins with the binding of the male and female sex cells, i.e. forming an egg cell, called zygote. The zygote will divide into two cells, then these two will divide into four, and so on.