Stages of Development of the Fetus - Women's Health Issues - MSD Manual Consumer Version (2023)

FAQs

What are the stages of fetal growth and 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.

The correct sequence of embryogenesis is Fertilization- cleavage- gastrulation- differentiation.

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.

So, the correct option is 'Cleavage, blastulation, gastrulation'

The embryonic period is the most critical period of development because of the formation of internal and external structures. The critical periods of development for the organs are also discussed in the section on specific organ development.

The fetus will change a lot throughout a typical pregnancy. This time is divided into three stages, called trimesters. Each trimester is a set of about three months.

The 8-cell stage is a period in embryonic development when the conceptus has undergone 3 cleavages from a single cell, resulting in 8 cells. In some mammals, it is at this stage of development that the individual cells begin to adhere tightly, a process called compaction.

Stage 5 comprises embryos that are implanted to a varying degree but are previllous, i.e., that do not yet show definite chorionic villi. Such embryos are believed to be 7-12 days old. The chorion varies from about 0.3 to 1 mm, and the embryonic disc measures approximately 0.1-0.2 mm in diameter.

Defining the Fetal Stage

A fetus is a prenatal human being between the embryonic stage and birth. The fetal stage extends from the beginning of the ninth week after fertilization to about 38 weeks after fertilization, which is the average time of birth. The fetal stage lasts a total of approximately 30 weeks.

Which answer lists the stages of the life cycle in the correct order? ›

Answer and Explanation: The correct list of those provided is: C) Zygote, cleavage, morula, blastocyst, embryo, fetus.

During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation.

The embryonic period is very critical because every organ system is formed. One system that gets a lot of discussion in this critical time period is the neural tube (what eventually becomes the spinal cord, nervous system, and brain).

The fetal stage has some characteristics as described below: The development of the bodily systems until the respiratory and digestive systems could already function independently from the mother. The growth of bones and muscles that make up the body of the fetus make it possible for the fetus to develop reflexes.

The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, infectious agents, radiation, certain medications, tobacco and toxic substances.

Month 3 (Weeks 9-12) – From Embryo to Fetus

After the eighth week of pregnancy, your growing baby is now called a fetus instead of an embryo. This begins the final stage of development, called the fetal stage.

The second stage, or the embryonic stage, lasts from the third week through the eighth week, and it's when the embryo develops until it becomes a fetus. The last and the longest stage of prenatal development is called the fetal stage, and it lasts from the ninth week until birth.

Our new Thrive philosophy is born from six stages of human development: social-emotional, intellectual, moral, psychological, physical, and spiritual.

There are usually six stages in this cycle: requirement analysis, design, development and testing, implementation, documentation, and evaluation.

What are the stages of development process? ›

4-Cell Embryo (Zgt)

The 4-cell embryo is the result of a second cleavage event, and occurs at approximately 40 hours after fertilization. The individual cells are called blastomeres. At this stage, the process of embryonic genome activation is initiated in human embryos, and lasts until the 8-cell stage.

The cell cycle is composed of interphase (G₁, S, and G₂ phases), followed by the mitotic phase (mitosis and cytokinesis), and G₀ phase.

The term morula is used to designate the ensuing stages of embryonic development (16, 32,and 64 cells). The morula is thus the product of the first cell cleavages, which result in practically no growth, because the daughter cells become smaller and smaller.

Almost all major organs have started to form, including the lungs, liver, kidneys, stomach, and pancreas. The unborn baby has arm and leg buds. The embryo starts receiving nutrients and oxygen and expelling waste using the umbilical cord and placenta.

Once the cavitation has occurred, we can see the fluid in the cavity between the cells and we call the embryo an early blastocyst. Although morula stage embryos are usually seen on day 4 and blastocysts are usually seen on day 5, sometimes we have only morulas on day 5.

Grade 4. Cells are of equal or unequal size; fragmentation is moderate to heavy. Grade 1 through 2.5 embryos seem to have the greatest potential for developing to the blastocyst stage.

These included planning, creating, developing, testing, and deploying. Note that it left out the major stages of analysis and maintenance. What Are the 7 Phases of SDLC? The new seven phases of SDLC include planning, analysis, design, development, testing, implementation, and maintenance.

Every animal's life goes through the same cycle: birth, growth, maturity, reproduction, and finally, death.

Systems development life cycle phases include planning, system analysis, system design, development, implementation, integration and testing, and operations and maintenance.

What is the correct order of human development from the first stage to the last )? ›

Or maybe four: infancy, childhood, adolescence, and adulthood. Developmentalists often break the lifespan into eight stages: Prenatal Development. Infancy and Toddlerhood.

The correct sequence of prenatal development is: germinal period, embryonic period, fetal period.

The three phases of early embryonic development in animals are cleavage, gastrulation, and organogenesis. During cleavage, the zygote divides multiple times, producing a larger number of smaller cells.

Final Answer: The correct sequence of embryonic development is: Zygote - Morula - Blastula - Gastrula - Embryo.

IVF involves several steps — ovarian stimulation, egg retrieval, sperm retrieval, fertilization and embryo transfer.

There are three main stages in fertilization: sperm capacitation and acrosome reaction, sperm-egg binding and fusion, and cortical reaction and oocyte activation. Briefly, sperm capacitation occurs in the female genital tract and prepares sperm cells for the acrosome reaction.

Our new Thrive philosophy is born from six stages of human development: social-emotional, intellectual, moral, psychological, physical, and spiritual.

Infants (birth to 2 years) Early childhood (3–8 years) Adolescence (9–18 years) Early adulthood (19–45 years) Middle adulthood (46–65 years) Later adulthood (65+ years).