The amnion of mammalian embryo is derived from
Show Hint
The amnion is a vital extraembryonic membrane that plays a crucial role in the development and protection of mammalian embryos.
- ectoderm and endoderm
- ectoderm and mesoderm
- mesoderm and trophoblast
- endoderm and mesoderm
The Correct Option is B
Approach Solution - 1
The correct answer is Option B) ectoderm and mesoderm
The developing fetus resides in the amniotic cavity, surrounded by the amnion membrane. The amnion membrane is derived from the extra somatic ectoderm on the inner side and mesoderm on the outer side. The extraembryonic or fetal membranes consist of the amnion, chorion, allantois, and yolk sac.
- The amnion is formed from the mesoderm on the outer side and ectoderm on the inner side.
- The chorion is formed from the trophoectoderm and mesoderm.
- The allantois and yolk sac membranes have mesoderm on the outer side and endoderm on the inner side.
Therefore, Option B is the correct answer.
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Approach Solution -2
The correct answer is Option B) ectoderm and mesoderm
Real Life Applications
The amnion is a thin, transparent membrane that surrounds the embryo in mammals. It is derived from the ectoderm and mesoderm, two of the three germ layers that form during embryonic development. The amnion plays a number of important roles in the development of the embryo, including:
- Protecting the embryo from mechanical injury.
- Maintaining a constant temperature around the embryo.
- Providing a cushion of fluid that allows the embryo to move freely.
- Secreting allantoic fluid, which helps to remove waste products from the embryo.
- The amnion is a vital part of the development of the mammalian embryo. Without it, the embryo would be more susceptible to injury and would not be able to develop properly.
Question can also be asked as
- What are the germ layers of a mammalian embryo?
- Which germ layer gives rise to the amnion?
- What is the function of the amnion?
Approach Solution -3
The correct answer is Option B) ectoderm and mesoderm
The amnion is a vital extraembryonic membrane that plays a crucial role in the development and protection of mammalian embryos. It is derived from specific layers of cells during embryogenesis.
Significance of the Amnion
- The amnion is an extraembryonic membrane that surrounds the developing mammalian embryo.
- It forms a protective sac called the amniotic cavity, containing the fetus and amniotic fluid, providing a suitable environment for growth.
- The amnion membrane is derived from two primary germ layers: the ectoderm and the mesoderm.
- The ectoderm is the outermost layer of cells, while the mesoderm lies beneath the ectoderm.
Ectoderm
- The inner side of the amnion is derived from the ectoderm layer during embryonic development.
- The ectoderm cells undergo specific processes to form the amniotic membrane.
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Mesoderm
- The outer side of the amnion originates from the mesoderm layer.
- The mesoderm cells adjacent to the ectoderm contribute to the formation of the amnion membrane.
The amnion's formation involves close interaction and collaboration between the ectoderm and mesoderm layers. The specific cells within these layers undergo differentiation and morphogenetic processes to construct the amnion structure. The ectoderm contributes to the inner side, while the mesoderm forms the outer side of the amnion. This collaborative development ensures the formation of a protective sac, the amniotic cavity, that nurtures and shields the developing embryo.
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Embryonic Development
A successful pregnancy goes through several distinct stages. A man’s sperm must reach, penetrate, and fertilize a woman’s egg.
1. Fertilization
Fertilization is the association of the female gamete (egg) and the male gamete (spermatozoa). Whether it occurs naturally inside the female reproductive system or with the help of reproductive technologies outside of the human body. Further, the product is a structure called a zygote.
2. Blastocyst Development
After fertilization, the embryo is created from a small group of cells that are constantly splitting inside of a complex structure called the blastocyst. It is formed by two groups of cells, inner and outer cells, and fluids. The blastocyst remains inside a protective cover during maturation called zona pellucida, which could be described as an eggshell. The outer cells are located just below this cover, which will create the future placenta and surrounding tissues to support fetal development in the uterus.
3. Blastocyst Implantation
When the blastocyst outreach the uterus it implants in the endometrium, the mucus membrane which lines the uterus. The external cells of the blastocyst and the uterine inner lining, altogether, create the future placenta. A structure that transfers nutrients to the baby and removes his/her wastes is called the placenta.
4. Embryo Development
As the blastocyst reaches the final stage in the implantation process into the inner lining of the uterus, it evolves into a structure called an embryo. At this time, internal organs and external structures develop. The mouth, lower jaw, and throat are emerging, while the blood circulation system starts its evolution and a heart tube is created. The ears arise and arms, fingers, legs, toes, and eyes are being shaped. The spinal cord and the brain are already formed, while the digestive tract and sensory organs start their development. The cartilage is being replaced by the first bones.
5. Fetal Development
The embryo moves into the final stage of development by the twelfth week of fertilization, called the fetal stage. Till now, the fetus has formed all of the organs and structures that are necessary for a baby, but those organs still need to grow and develop.