Table of Contents
What are the stages of fetal and embryonic 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 stages of development of a zygote?
First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
What is the first stage in embryonic development?
The early stages of embryonic development begin with fertilization. The process of fertilization is tightly controlled to ensure that only one sperm fuses with one egg. After fertilization, the zygote undergoes cleavage to form the blastula.
What is morula stage?
The morula stage is defined as the stage of development during which the dividing cell mass has 20–30 cells and resembles a mulberry, hence the term morula. From: The Science of Animal Growth and Meat Technology (Second Edition), 2019.
Which is the correct order of events during development?
Hence the correct sequence of the embryogenesis is Fertilization- cleavage- gastrulation- differentiation.
What is the fetal period of development?
Defining the Fetal Stage 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.
Is morula a zygote?
morula, solid mass of blastomeres resulting from a number of cleavages of a zygote, or fertilized egg. Its name derives from its resemblance to a mulberry (Latin: morum). A morula is usually produced in those species the eggs of which contain little yolk and, consequently, undergo complete cleavage.
What is a zygote a morula and blastocyst?
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.
What are the steps of reproduction?
Sexual reproduction consists of a set of events and can be divided into three stages: Pre-fertilization, Fertilization, and Post-fertilization.
What events occur prior to morula formation in human embryo?
A key event prior to morula formation is “compaction”, where the 8 cell embryo undergoes changes in cell morphology and cell-cell adhesion that initiates the formation of this solid ball of cells. In humans, morula stage of development occurs during the first days in week one following fertilization (GA week 3) and is described as Carnegie stage 2.
What are the developmental stages of the baby in the womb?
The life of the baby in the womb is called prenatal or intrauterine and is divided into 3 developmental stages: Germinal development is the 1st of the 3 stages of a child’s development in his prenatal life.
What is the final stage of development of an embryo?
After ten-twelve weeks of pregnancy, the embryo moves into the final stage of development, a fetus. Severe problems with embryonic development can occur as early as the first 3 weeks.
What is the morula stage of development?
In humans, morula stage of development occurs during the first days in week one following fertilization ( GA week 3) and is described as Carnegie stage 2. This stage is followed by formation of a cavity, the blastocoel, which defines formation of the blastocyst .