Athena Vale
The ectoderm is one of the three germ layers that form during the later stages of fertilisation. The other two layers are the mesoderm and the endoderm. The ectoderm is the outermost layer and it gives rise to the nervous system, epidermis, hair, nails, and various neural crest-derived tissues. The mesoderm is the middle layer, which gives rise to muscle cells, connective tissue, and the circulatory system. Therefore, it can be concluded that the ectoderm does not lead to muscles, but rather, it is the mesoderm that gives rise to muscle cells.
| Characteristics | Values |
|---|---|
| What is it? | Ectoderm is one of the three germ layers that form during embryogenesis. |
| Discovery | Discovered by Heinz Christian Pander in 1817 while studying chick embryos. |
| Development | The ectoderm develops into the epidermis, central and peripheral nervous systems, and the retina. |
| Muscle Development | Ectoderm does not lead to muscle development. The mesoderm is the middle layer of cells that develop into smooth muscle cells. |
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What You'll Learn
The ectoderm is the outermost of the three germ layers
The ectoderm is one of the three germ layers that form during the early stages of embryonic development. The three germ layers are the ectoderm, mesoderm, and endoderm. These layers develop early in embryonic life, through the process of gastrulation. During gastrulation, a hollow cluster of cells called a blastula reorganizes into two primary germ layers: an inner layer, called the endoderm, and an outer layer, called the ectoderm.
The ectoderm was first discovered by Heinz Christian Pander, a Baltic German-Russian biologist, in 1817. Pander studied chicken eggs and discovered the three germ layers that form during embryogenesis. Pander is sometimes referred to as the "founder of embryology." His work was continued by Karl Ernst von Baer, a Prussian-Estonian biologist, who extended the concept of germ layers to all vertebrates.
In the early 20th century, Hilde Proescholdt Mangold and her doctoral advisor, Hans Spemann, conducted experiments that challenged the traditional germ layer theory. Mangold transplanted ectoderm tissue from the dorsal lip of an embryonic newt to a different germ layer of another species of newt. The transplanted ectoderm responded to the local environment and induced the formation of an extra head, nervous system structure, or extra body. This experiment demonstrated that the fates of germ layer cells are not predetermined and that the three germ layers have the potential for varied development.
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The mesoderm gives rise to muscle cells
The mesoderm is one of the three primary germ cell layers that form during the early embryonic stage. The other two layers are the ectoderm and the endoderm. During the third week of embryonic development, a process called gastrulation creates a mesodermal layer between the endoderm and the ectoderm.
The mesoderm is the middle layer of cells that will develop into connective tissue, smooth muscle, the cardiovascular system, blood, skeleton, reproductive and endocrine systems. The mesoderm gives rise to the musculoskeletal system, including bone, cartilage, and muscle. It also gives rise to the heart, blood vessels, and blood cells of the circulatory system. The mesoderm forms mesenchyme, mesothelium, and coelomocytes. Mesothelium lines coeloms. Mesoderm forms the muscles in a process known as myogenesis, septa (cross-wise partitions), and mesenteries (length-wise partitions).
The mesoderm differentiates from the rest of the embryo through intercellular signaling. After this, the mesoderm is polarized by an organizing center. The position of the organizing center is determined by the regions where beta-catenin is protected from degradation by GSK-3. Beta-catenin acts as a co-factor that alters the activity of the transcription factor tcf-3 from repressing to activating, which initiates the synthesis of gene products critical for mesoderm differentiation and gastrulation.
The paraxial mesoderm is segmented into sequentially ordered blocks of cells called somites, which differentiate into the sclerotome and dermomyotome, giving rise to the axial skeleton and muscles, respectively. The myotome and dermatome have a nerve component.
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The ectoderm forms shortly after fertilization
The ectoderm is one of the three primary germ layers formed in early embryonic development. The other two germ layers are the mesoderm and the endoderm. The ectoderm forms shortly after fertilization, after which rapid cell division begins. The ectoderm is the outermost layer of the three germ layers, with the mesoderm being the middle layer and the endoderm being the innermost layer.
The ectoderm is the first layer to form from a fertilized egg. During the process of gastrulation, bottle cells invaginate on the dorsal surface of the blastula to form the blastopore. The cells continue to extend inward and migrate along the inner wall of the blastula to form a fluid-filled cavity called the blastocoel. The cells of the animal pole, which were once several layers thick, divide to form a thin layer. When this thin layer of dividing cells reaches the dorsal lip of the blastopore, another process occurs called convergent extension. During convergent extension, cells that approach the lip intercalate mediolaterally, in such a way that cells are pulled over the lip and inside the embryo. These two processes allow for the prospective mesoderm cells to be placed between the ectoderm and the endoderm. Once convergent extension and radial intercalation are underway, the rest of the vegetal pole, which will become endoderm cells, is completely engulfed by the prospective ectoderm, as these top cells undergo epiboly, where the ectoderm cells divide in a way to form one layer. This creates a uniform embryo composed of the three germ layers in their respective positions.
The ectoderm gives rise to the skin, nervous system, and sense organs. It differentiates to form epithelial and neural tissues, including the skin, linings of the mouth, anus, nostrils, sweat glands, hair, nails, and tooth enamel. The surface ectoderm gives rise to most epithelial tissues, while the neural plate gives rise to most neural tissues. The neural plate and neural crest are also referred to as the neuroectoderm. During neurulation, the ectoderm differentiates into two parts: the surface ectoderm and the neuroectoderm. The surface ectoderm gives rise to tissues on the outer surface of the body, such as the epidermis, hair, and nails. The neuroectoderm forms the nervous system of the embryo and further divides into the neural tube and the neural crest. The neural tube acts as the precursor for the embryo's central nervous system, while the neural crest helps form many of the bones and connective tissues of the head and face, as well as parts of the peripheral nervous system.
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The ectoderm gives rise to the nervous system
The ectoderm is one of the three primary germ layers formed in early embryonic development. The other two are the mesoderm and the endoderm. The ectoderm is the outermost layer, with the mesoderm being the middle layer and the endoderm being the innermost layer. The epiblast becomes the ectoderm, which will develop into the epidermis, central and peripheral nervous systems, and the retina.
During neurulation, the ectoderm differentiates into two parts. The first is the surface ectoderm, which gives rise to tissues on the outer surface of the body, like the epidermis, hair, and nails. The second is the neuroectoderm, which forms the nervous system of the embryo. The neural plate and neural crest are also referred to as the neuroectoderm as they are derived from the ectoderm. The neural plate and neural crest further divide into the neural tube, which acts as the precursor for the embryo's central nervous system, and the neural crest, a collection of mobile cells shed from the junction between the neural tube and the epidermis after the neural tube forms. The neural crest helps form many of the bones and connective tissues of the head and face, as well as parts of the peripheral nervous system.
The ectoderm expresses a wide range of signaling molecules, including FGFs, BMPs, WNTs, and HHs. FGF-9, for example, is an important factor during the initiation of tooth germ development. The rate of epithelial invagination is significantly increased by the action of FGF-9, which is only expressed in the epithelium and not in the mesenchyme. FGF-10 helps stimulate epithelial cell proliferation to make larger tooth germs.
The notochord induces the formation of the neural plate, which further differentiates to form neural folds with a neural groove in between, leading to the formation of the neural tube (via neurulation). The neural tube becomes the neuroectoderm, which forms the CNS, namely the brain and spinal cord.
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The ectoderm gives rise to the epidermis
The ectoderm is one of the three primary germ layers formed in early embryonic development. The other two layers are the mesoderm and the endoderm. The ectoderm is the outermost layer, superficial to the mesoderm (the middle layer) and the endoderm (the innermost layer). It emerges and originates from the outer layer of germ cells. The word "ectoderm" comes from the Greek "ektos", meaning "outside", and "derma", meaning "skin".
The ectoderm is the precursor of the epidermis and the nervous system. The epidermis is a superficial layer of stratified epithelium that acts as a physical and chemical barrier between the body's interior and the exterior environment. The ectoderm also gives rise to the epidermis, hair, nails, oral epithelium, cornea, and olfactory epithelium. In vertebrates, the ectoderm gives rise to the hair, skin, nails or hooves, and the lens of the eye. It also forms the epithelia (surface, or lining, tissues) of sense organs, the nasal cavity, the sinuses, the mouth (including tooth enamel), and the anal canal.
During neurulation, the ectoderm differentiates into two parts. The first is the surface ectoderm, which gives rise to tissues on the outer surface of the body, and the second is the neuroectoderm, which forms the nervous system of the embryo. The neural crest helps form many of the bones and connective tissues of the head and face, as well as parts of the peripheral nervous system. In fishes, the neural crest helps form dorsal fins, and in turtles, it helps form the carapace.
The ectoderm expresses a wide range of signaling molecules, including FGFs, BMPs, WNTs, and HHs. It is the restriction of Fgf8 expression to the oral (and pericleftal) ectoderm that appears to set up the anterior-posterior (AP) axis of BA1. The restriction of Gsc expression to aboral mesenchyme involves repression by Lhx6/7-expressing cells.
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Frequently asked questions
Ectoderm is the outermost of the three germ layers, or masses of cells, that appears early in the development of an animal embryo.
The ectoderm gives rise to the nervous system, the epidermis, hair, nails, and the lens of the eye, among other tissues.
No, the mesoderm is the middle layer of cells that will develop into smooth muscle, connective tissue, and the circulatory system.
The three germ layers are the endoderm, the ectoderm, and the mesoderm.
