The germ layers represent some of the first lineage-specific (multipotent) stem cells (e.g., cells destined to contribute to specific types of tissue, such as muscle or blood) in embryonic development. Hence, each germ layer eventually gives rise to certain tissue types in the body.
- 1 What do the 3 germ layers become?
- 2 What tissues develop from the three germ layers?
- 3 What does the endoderm become?
- 4 What do ectoderm cells become?
- 5 What are the 4 stages of embryonic development?
- 6 What does the mesoderm do?
- 7 What structures develop from the ectoderm?
- 8 What does the ectoderm become quizlet?
- 9 What does Epiblast become?
- 10 What is the blastocyst?
- 11 What does the embryoblast develop into?
- 12 What does the trophoblast become?
- 13 What does the allantois develop into?
- 14 What is blastocyst and trophoblast?
- 15 What does the cytotrophoblast become?
- 16 What does the amniotic cavity become?
- 17 What is the difference between a morula and a blastocyst?
- 18 How does placenta develop?
- 19 Does the sperm create the placenta?
- 20 Where does the pregnancy start?
- 21 How is an embryo produced?
- 22 What is it called when sperm and egg join?
- 23 What involves fertilization?
What do the 3 germ layers become?
The three germ layers are the endoderm, the ectoderm, and the mesoderm. Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body.
What tissues develop from the three germ layers?
The body tissues and organs develop from the three primary germ layers that form during the growth process of the human embryo.
These body tissues include:
- Fibrous tissue.
- Bone and cartilage.
- Fat or adipose tissue.
- Blood and lymph vessels.
- Blood cells.
What does the endoderm become?
The embryonic endoderm develops into the interior linings of two tubes in the body, the digestive and respiratory tube. the lining of the follicles of the thyroid gland and the epithelial component of the thymus (i.e. thymic epithelial cells).
What do ectoderm cells become?
Generally speaking, the ectoderm differentiates to form epithelial and neural tissues (spinal cord, peripheral nerves and brain). This includes the skin, linings of the mouth, anus, nostrils, sweat glands, hair and nails, and tooth enamel. Other types of epithelium are derived from the endoderm.
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 does the mesoderm do?
The mesoderm is responsible for the formation of a number of critical structures and organs within the developing embryo including the skeletal system, the muscular system, the excretory system, the circulatory system, the lymphatic system, and the reproductive system.
What structures develop from the ectoderm?
In vertebrates, ectoderm subsequently gives rise to hair, skin, nails or hooves, and the lens of the eye; the epithelia (surface, or lining, tissues) of sense organs, the nasal cavity, the sinuses, the mouth (including tooth enamel), and the anal canal; and nervous tissue, including the pituitary body and chromaffin …
What does the ectoderm become quizlet?
The ectoderm develops into the epithelium of the skin, whereas this layer gives rise to the epithelial lining of the gut tube.
What does Epiblast become?
The epiblast gives rise to the embryo and the amnion. As the primary yolk sac involutes, the secondary yolk sac develops.
What is the blastocyst?
Three days after fertilization, a normally developing embryo will contain about six to 10 cells. By the fifth or sixth day, the fertilized egg is known as a blastocyst — a rapidly dividing ball of cells. The inner group of cells will become the embryo. The outer group will become the cells that nourish and protect it.
What does the embryoblast develop into?
Just before implantation, the cells in the embryoblast start to differentiate into two layers – the epiblast (primary ectoderm), and an internal layer of cuboidal cells called the hypoblast (or primary endoderm).
What does the trophoblast become?
Trophoblasts are cells that form the outer layer of a blastocyst, which provides nutrients to the embryo, and then develop into a large part of the placenta. Trophoblast invasion is a critical process in the establishment of a successful pregnancy.
What does the allantois develop into?
The embryonic allantois becomes the fetal urachus, which connects the fetal bladder (developed from cloaca) to the yolk sac. The urachus removes nitrogenous waste from the fetal bladder.
What is blastocyst and trophoblast?
The blastocyst is a structure formed in the early development of mammals. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast.
What does the cytotrophoblast become?
An undifferentiated cytotrophoblastic stem cell will differentiate into a villous cytotrophoblast, which is what constitutes primary chorionic villi, and will eventually coalesce into villous syncytiotrophoblast.
What does the amniotic cavity become?
The amnion is a membrane that closely covers the human and various other embryos when first formed. It fills with amniotic fluid, which causes the amnion to expand and become the amniotic sac that provides a protective environment for the developing embryo.
What is the difference between a morula and a blastocyst?
A morula is distinct from a blastocyst in that a morula (3–4 days after fertilization) is a mass of 16 totipotent cells in a spherical shape whereas a blastocyst (4–5 days after fertilization) has a cavity inside the zona pellucida along with an inner cell mass.
How does placenta develop?
The development of the placenta begins during implantation of the blastocyst. The 32-64 cell blastocyst contains two distinct differentiated embryonic cell types: the outer trophoblast cells and the inner cell mass. The trophoblast cells form the placenta. The inner cell mass forms the foetus and foetal membranes.
Does the sperm create the placenta?
The male germ cell, the sperm, conveys the father’s entire contribution to pregnancy. Following sperm fertilization of the oocyte, the preimplantation blastocyst develops. The blastocyst contains an inner cell mass, which develops into the fetus, and the trophectoderm, which will form the placenta.
Where does the pregnancy start?
Pregnancy officially starts when a fertilized egg implants in the lining of the uterus. It takes up to 2-3 weeks after sex for pregnancy to happen.
How is an embryo produced?
From Egg to Embryo
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 it called when sperm and egg join?
The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female’s reproductive system. When sperm fertilizes (meets) an egg, this fertilized egg is called a zygote (ZYE-goat). The zygote goes through a process of becoming an embryo and developing into a fetus.
What involves fertilization?
Fertilization can be defined as the union of two haploid gametes, the spermatozoa and the oocyte, hereto referred to as egg, to restore the diploid state, form a zygote through the process of egg activation, and commence a series of mitotic divisions that results in cell differentiation and embryo development.