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What are the stages of the germinal period?

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 are the characteristics of Germinal Stage?

During the germinal stage, the cells necessary for the placenta, umbilical cord, and amniotic fluid will differentiate to form the embryo. The mass of cells has yet to attach itself to the lining of the uterus; once this attachment occurs, the next stage begins.

What is the germinal period of pregnancy?

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.

When does a fetus become a baby?

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.

How long does the germinal stage last?

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 is Germinal Stage?

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 a germinal stage?

Which trimester is the most critical for fetal development?

The first trimester is the most crucial to your baby’s development. During this period, your baby’s body structure and organ systems develop. Most miscarriages and birth defects occur during this period. Your body also undergoes major changes during the first trimester.

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, all structures are present although immature.

How many weeks is 9 months pregnant?

Is pregnancy nine or 10 months long? Your 40 weeks of pregnancy are counted as nine months.

How do I know if my baby is developing normally in the womb?

An ultrasound is usually done for all pregnant women at 20 weeks. During this ultrasound, the doctor will make sure that the placenta is healthy and attached normally and that your baby is growing properly. You can see the baby’s heartbeat and movement of its body, arms, and legs on the ultrasound.

Which period of prenatal development is the most critical?

The embryonic period is the most critical period of development because of the formation of internal and external structures.

How long does the germinal stage of development last?

The main events in this stage of development are illustrated in Figure 23.2. 2 and described in detail in the rest of this concept. The germinal stage lasts a total of eight to nine days.

When does the germinal period of pregnancy begin?

Conception is also the beginning of the germinal period of prenatal development. This stage occurs during the first 2 weeks of development (or the 2nd – 4th weeks of pregnancy). The union of the sperm and egg cell forms a single cell called a zygote.

What happens in the germinal stage of the zygote?

The germinal stage continues as the zygote undergoes several initial cell divisions to form a solid ball of cells called a morula (days 3-4). It then continues as the morula undergoes additional changes to become a hollow ball of cells called a blastocyst (days 5-7).

Where do nutrients come from in the germinal stage?

In the germinal stage, however, nutrients must be obtained from cell cytoplasm or secretions in the Fallopian tube or uterus. The germinal stage involves several different processes that change an egg and sperm first into a zygote, and then into an embryo.