What are the three stages of prenatal development?
- Ectoderm: Skin and nervous system
- Endoderm: Digestive and respiratory systems
- Mesoderm: Muscle and skeletal systems
What are the stages of pregnancy development?
- First trimester – conception to 12 weeks
- Second trimester – 12 to 24 weeks
- Third trimester – 24 to 40 weeks.
What are the stages of fetal development?
- Your baby's eyelids are more developed and begin to close.
- The outer ears begin to take shape.
- Baby's facial features become more distinct.
- The intestines rotate.
- At the end of the 10th week of pregnancy, your baby is no longer an embryo. It is now a fetus, the stage of development up until birth.
What happens during the germinal stage?
What are the 3 stages of pregnancy?
- First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby's development.
- Second Trimester (14 to 26 Weeks) The second trimester of pregnancy is often called the "golden period" because many of the unpleasant effects of early pregnancy disappear.
- Third Trimester (27 to 40 Weeks)
What are the 3 stages of prenatal development?
Prenatal development is the process in which an embryo or fetus (or fetus) gestates during pregnancy. Normal prenatal development lasts about 38 weeks and is divided into three stages: germinal, embryonic, and fetal.
Which of the following is in the correct order of the three periods in prenatal development from conception to birth quizlet?
There are three stages of prenatal development: germinal, embryonic, and fetal.
What are the 3 stages of prenatal development quizlet?
This period is generally divided into three stages: the germinal stage, the embryonic stage, and the fetal stage.
Which order of prenatal events is correct?
From beginning as a one-cell structure to your birth, your prenatal development occurred in an orderly and delicate sequence. There are three stages of prenatal development: germinal, embryonic, and fetal.
Which is the correct order of the stages of prenatal development quizlet?
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 three stages of prenatal development what happens at the beginning of each stage quizlet?
Terms in this set (3)stage 1. the Germinal stage: zygote. time span: conception at two weeks. development that occurs: the key steps in establishing a pregnancy.stage 2. the Embyronic stage: embyro. time span: third through eighth week. ... stage 3. the Fetal stage: fetus. time span: eighth or ninth week through birth.
What are the stages of development from conception to birth quizlet?
Terms in this set (11)Germinal Phase (1) Conception-2 weeks. -Zygote. ... Zygote. In the germinal phase. ... Placenta. In the germinal phase. ... Embryonic Stage (2) 2-8 weeks. ... Fetal Stage (3) 8th week-birth. ( ... 3rd month. Part of the Fetal Stage. ... 4th month. Part of the Fetal Stage. ... 5th month. Part of the Fetal Stage.More items...
Which of the following is not one of the 3 main periods of prenatal development?
Which of the following is NOT one of the three periods of prenatal development? teratogen.
What are the three periods of prenatal development?
Answer: Typical prenatal development can be divided into three periods: germinal, embryonic, and fetal. The first period is called the germinal period. During this time, the zygote is created, cell division takes place, and the zygote attaches to the uterine wall. The second period is called the embryonic period.
What is the time between conception and birth called?
Development happens quickly during the prenatal period, which is the time between conception and birth. This period is generally divided into three stages: the germinal stage, the embryonic stage, and the fetal stage. The two-week period after conception is called the germinal stage.
What is the first two weeks 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.
Why is the prenatal period important?
While you might think of child development as something that begins during infancy, the prenatal period is also considered an important part of the developmental process. Prenatal development is a time of remarkable change that helps set the stage for future psychological development. The brain develops over the course of the prenatal period, but it will continue to go through more changes during the early years of childhood
What is the germinal stage of a sperm?
The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg is called a zygote. Just a few hours after conception, the single-celled zygote begins making a journey down the fallopian tube to the uterus.
What is the fetal stage?
Fetal Stage. Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. The fetal period of prenatal develop marks more important changes in the brain. This period of development begins during the ninth week and lasts until birth.
How many cells do zygotes divide?
Cell division begins approximately 24 to 36 hours after conception. Through the process of mitosis, the zygote first divides into two cells, then into four, eight, sixteen, and so on. A significant number of zygotes never progress past this early part of cell division, with as many as half of all zygotes surviving less than two weeks.
How much does an embryo weigh?
By the eighth week of development, the embryo has all of the basic organs and parts except those of the sex organs. At this point, the embryo weighs just one gram and is about one inch in length. By the end of the embryonic period, the basic structures of the brain and central nervous system have been established.
What is going on in the brain during the second trimester?
So what's going on inside the brain during this important period of prenatal development? The brain and central nervous system also become more responsive during the second trimester. Around 28 weeks, the brain starts to mature faster, with an activity that greatly resembles that of a sleeping newborn.