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 first period of prenatal development?
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.
What are the 5 stages of prenatal development?
- Germinal stage. Conception occurs when the female egg (ovum) is fertilized by a the male sperm. …
- Embryonic stage. The embryonic stage begins after implantation and lasts until eight weeks after conception. …
- Fetal stage. …
- Congenital abnormalities. …
- Maternal derived abnormalities. …
- Prematurity. …
- BOOKS. …
- PERIODICALS.
What is the stages of prenatal development?
There are three stages of prenatal development: germinal, embryonic, and fetal.What are the three periods of prenatal development quizlet?
11.1 Outline the major events of the three stages of prenatal development. Prenatal development proceeds through the germinal (first 2 weeks), embryonic (2 weeks to 2 months), and fetal stages (2 months to birth) as the zygote is differentiated into a human organism.
What are the 3 periods of prenatal development?
This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is a period of cell division and initial differentiation (cell maturation), (2) the embryonic period, or period of organogenesis, which lasts …
Which of the following terms refers to a fertilized ovum?
zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm).
What are the 4 stages of embryonic development?
- 1.1 Fertilization.
- 1.2 Cleavage.
- 1.3 Blastulation.
- 1.4 Implantation.
- 1.5 Embryonic disc.
What do you mean by prenatal stage?
Prenatal development: The process of growth and development within the womb, in which a single-cell zygote (the cell formed by the combination of a sperm and an egg) becomes an embryo, a fetus, and then a baby.
What is the embryonic period?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.
Article first time published onWhich is the correct order of development?
In the field of developmental psychology, the process of human development can be divided into 8 separate stages. These stages are prenatal, infancy, early childhood, middle childhood, adolescence, young adulthood, middle adulthood, and late adulthood.
What does the quickening mean?
Quickening is defined as the first movements of the fetus felt in utero. It occurs from the eighteenth to the twentieth week of pregnancy. The mother becomes conscious of slight fluttering movements in her abdomen which are due to movements of the fetus. …
What is an implanted blastocyst?
Implantation is a process in which a developing embryo, moving as a blastocyst through a uterus, makes contact with the uterine wall and remains attached to it until birth. … Such implantation is unique to mammals, but not all mammals exhibit it.
What is meant by teratogen?
A teratogen is any agent that causes an abnormality following fetal exposure during pregnancy. Teratogens are usually discovered after an increased prevalence of a particular birth defect.
How long is each of the three stages of pregnancy quizlet?
The stages of development during pregnancy is divided into trimesters. There are three trimesters during pregnancy with three months each trimester adding up to a total of 9 months.
Which period of prenatal development is the most critical and why?
The embryonic period is the most critical period of development because of the formation of internal and external structures.
What is meant by the term Fertilisation?
Fertilization: The process of combining the male gamete, or sperm, with the female gamete, or ovum. The product of fertilization is a cell called a zygote.
Which term describes the fertilized egg in the first two weeks of prenatal development?
Conception begins the germinal period; this is followed by the embryonic period and finally the fetal period. … Which of the following terms describes the fertilized egg in the first two weeks of prenatal development? Zygote. Rank the prenatal developmental stages in the correct order.
Which term refers to a fertilized egg quizlet?
STUDY. Only $35.99/year. What term refers to a fertilized ovum? Zygote.
What is post natal development?
Postnatal growth consists of at least three distinct phases, infancy, childhood, and puberty (11), which are influenced by different growth factors. Infant growth is largely a continuation of in utero growth, is influenced predominantly by nutrition, and is largely growth hormone independent (12).
Why is prenatal period a critical period?
In pregnancy, each part of the baby’s body forms at a specific time. During these times, the body can be very sensitive to damage caused by some medications, alcohol, or other harmful exposures. This specific time is called the “critical period of development” for that body part.
How long is prenatal period?
Prenatal development starts at conception and ends with the birth of your baby. It takes about 40 weeks or nine months to create a new life, and your pregnancy is broken into three, 12-week trimesters.
What happens in the first 4 weeks of embryonic and fetal development?
Just four weeks after conception, the neural tube along your baby’s back is closing. The baby’s brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form. Structures necessary to the formation of the eyes and ears develop.
What is the blastocyst stage of development?
The embryo usually reaches the uterine cavity about 5 or 6 days after fertilization. At this time, it is a blastocyst, or an embryo made up of about a hundred cells. In an IVF cycle, a blastocyst forms in a culture system in a laboratory.
How many developmental stages are there?
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 of the following is the correct order basic stages of embryology?
Zygote-morula-blastula-gastrula-embryo.
Which of the following is the correct order of events during early organogenesis?
Place the following steps of organogenesis in the correct order: (1) neural crest cells break away, (2) neural folds grow into a neural tube, (3) the notochord induces development of the neural plate. You just studied 57 terms!
Why is it called quickening?
The term quickening comes from the root word quick, an archaic synonym for “living.” (Think “the quick and the dead.”) The concept goes back at least to Aristotle, who believed that male fetuses take on human characteristics after 40 days in the womb, and female fetuses after about 80 days.
What is Ballottement in pregnancy?
ballottement. / (bəˈlɒtmənt) / noun. med a technique of feeling for a movable object in the body, esp confirmation of pregnancy by feeling the rebound of the fetus following a quick digital tap on the wall of the uterus.
What does it mean for a woman to quicken?
In pregnancy terms, quickening is the moment in pregnancy when the pregnant woman starts to feel her baby’s movement in the uterus.
What's the decidua?
The decidua is the specialized layer of endometrium that forms the base of the placental bed. The corpus luteum of the ovary (and later, the placenta itself) produces progesterone that induces endometrial stromal cells to undergo cellular modifications and vascular alterations termed the ‘decidual reaction.
