Question

The amnion of mammalian embryo is derived from

• A. ectoderm and endoderm
• B. ectoderm and mesoderm
• C. mesoderm and trophoblast
• D. endoderm and mesoderm

Hint:

The amnion is a vital extraembryonic membrane that plays a crucial role in the development and protection of mammalian embryos.

Answer 1

The Correct Option is B

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.

Discover More From the Concept: Embryology

Answer 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

1. What are the germ layers of a mammalian embryo?
2. Which germ layer gives rise to the amnion?
3. What is the function of the amnion?

Answer 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.