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.
Why is it called the germinal stage?
The two-week period after conception is called the germinal stage. Conception occurs when a sperm cell combines with an egg cell to form a zygote. About thirty-six hours after conception, the zygote begins to divide quickly. The resulting ball of cells moves along the mother’s fallopian tube to the uterus.
What are the 3 stages of fetal 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
Why is Germinal Stage important in prenatal development?
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 is the germinal stage of prenatal development?
The germinal stage of development is the first and shortest of the stages of the human lifespan. It lasts roughly eight to nine days, beginning with fertilization and ending with implantation in the endometrium of the uterus, after which the developing organism is called an embryo.
What is the germinal period quizlet?
germinal period. The period of prenatal development that takes place in the first two weeks after conception. It includes the creation of the zygote, continued cell division, and the attachment of the zygote to the uterine wall.
Which is the longest stage 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.
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 are the 5 stages of embryonic development?
The Stages of Embryo Development
Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa). Blastocyst Development. Blastocyst Implantation. Embryo Development. Fetal Development.
What are the 5 stages of conception?
The Journey from Egg to Embryo
Conception: From Egg to Embryo. Ovulation. Moving Into the Fallopian Tube. The Sperm’s Long Journey. Fertilization: Sperm Penetrates Egg. The Cells Start to Divide. Implantation. Pregnancy Hormones.
What event occurs at the end of the germinal period?
What major event occurs to end the germinal period? The zygote divides and that cluster of cells travels through the fallopian tubes into the uterus, where implantation occurs.
How does teratogens affect prenatal development?
As a baby grows in the womb, teratogens may affect parts of the baby’s body as they are forming. For example, the neural tube closes in the first 3 to 5 weeks of the pregnancy. During this time, teratogens can cause neural tube defects such as spina bifida.
What happens during the germinal stage how long does this stage last quizlet?
The two-week period after conception is called the germinal stage. Conception occurs when a sperm cell combines with an egg cell to form a zygote. About thirty-six hours after conception, the zygote begins to divide quickly. The resulting ball of cells moves along the mother’s fallopian tube to the uterus.
What is the zygotic stage?
zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
What marks the end of the germinal period quizlet?
The implantation of the blastocyst marks the end of the germinal period.
