25th November 2019

kenyon

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What does the endoderm mesoderm and ectoderm become?

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Endoderm, the most internal germ layer, forms the lining of the gut and other internal organs. Ectoderm, the most exterior germ layer, forms skin, brain, the nervous system, and other external tissues. Mesoderm, the the middle germ layer, forms muscle, the skeletal system, and the circulatory system.

Correspondingly, what develops from the mesoderm?

The intermediate mesoderm develops into kidneys and gonads. The paraxial mesoderm develops into cartilage, skeletal muscle, and dermis. The lateral plate mesoderm develops into the circulatory system (including the heart and spleen), the wall of the gut, and wall of the human body.

What organs will be formed by the cells of the mesoderm?

In vertebrates it subsequently gives rise to muscle, connective tissue, cartilage, bone, notochord, blood, bone marrow, lymphoid tissue, and to the epithelia (surface, or lining, tissues) of blood vessels, lymphatic vessels, body cavities, kidneys, ureters, gonads (sex organs), genital ducts, adrenal cortex, and

What is formed from the mesoderm?

The other two layers are the ectoderm (outside layer) and endoderm (inside layer), with the mesoderm as the middle layer between them. The mesoderm forms mesenchyme, mesothelium, non-epithelial blood cells and coelomocytes. Mesothelium lines coeloms.

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What main organ systems are derived from each of the three germ layers?

the three (bad word huh?) basic layers of the germ:

- endoderm (-> primitive gut - main part of the digestive organs),
- mesoderm (-> mesenchyme - circulatory system) and.
- ectoderm (-> receptors, nervous system)

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What is the role of the amnion?

Structure and Function of the Amnion: The amnion is a membranous sac which surrounds and protects the embryo. It is the first of the three cavities (amnion, chorion and yolk sac) in the embryo and is formed on 8 dpc.

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What do mesoderm cells become?

In general, ectoderm develops into parts of the skin, the brain and the nervous system. Mesoderm gives rise to bones, muscles, the heart and circulatory system, and internal sex organs. Endoderm turns into the inner lining of some systems, and some organs such as the liver and pancreas.

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What comes from the endoderm?

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). Liver and pancreas cells are believed to derive from a common precursor.

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What organs are derived from the endoderm?

Embryonic Derivatives of the Endoderm: The endoderm produces the gut tube and its derived organs, including the cecum, intestine, stomach, thymus, liver, pancreas, lungs, thyroid and prostate.

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What are the three primary germ layers?

These three layers, the endoderm, the ectoderm and the mesoderm, are called the primary germ layers. After gastrulation, the cup-like embryonic stage that contains at least two distinct germ layers is called the gastrula.

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What does the ectoderm make?

Generally speaking, the ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis (the outer part of integument). It also forms the lining of mouth, anus, nostrils, sweat glands, hair and nails.

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What organs will be formed by the cells of the mesoderm?

In vertebrates it subsequently gives rise to muscle, connective tissue, cartilage, bone, notochord, blood, bone marrow, lymphoid tissue, and to the epithelia (surface, or lining, tissues) of blood vessels, lymphatic vessels, body cavities, kidneys, ureters, gonads (sex organs), genital ducts, adrenal cortex, and

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What structure develops from the ectoderm?

The mesoderm is the middle germ layer that forms most organ systems. The ectoderm is the outer layer of an embryo that develops into the epidermis, derivatives of the epidermis, parts of the mouth and eye (like the cornea, lens, and retina), and most of the nervous system.

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Which germ layer gives rise to the epidermis?

The endoderm gives rise to the lining of the digestive system and respiratory system. A defect in these tissues suggests a problem of that germ layer during development. The ectoderm gives rise to the nervous system and epidermis. The mesoderm gives rise to the muscle and skeletal systems.

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What is Embryosis?

Embryogenesis is the process by which the embryo forms and develops. In mammals, the term refers chiefly to early stages of prenatal development, whereas the terms fetus and fetal development describe later stages. Embryogenesis starts with the fertilization of the egg cell (ovum) by a sperm cell, (spermatozoon).

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How does the primitive streak form?

The primitive streak is a transient structure whose formation, on day 15 of human development, marks the start of gastrulation, the process in which the inner cell mass in converted into the trilaminar embryonic disc, which is comprised of the three germ layers (ectoderm, mesoderm and endoderm).

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What is the role of oxytocin during childbirth?

Oxytocin has been best known for its roles in female reproduction. It is released in large amounts during labor, and after stimulation of the nipples. It is a facilitator for childbirth and breastfeeding.

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What develops from the epiblast?

The epiblast is derived from the inner cell mass and lies above the hypoblast. The epiblast gives rise to the three primary germ layers (ectoderm, definitive endoderm, and mesoderm) and to the extraembryonic mesoderm of the visceral yolk sac, the allantois, and the amnion.

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What happens during gastrulation and Neurulation?

Neurulation in vertebrates results in the formation of the neural tube, which gives rise to both the spinal cord and the brain. Neural crest cells are also created during neurulation. Neural crest cells migrate away from the neural tube and give rise to a variety of cell types, including pigment cells and neurons.

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Where do somites come from?

In vertebrates, somites subdivide into the sclerotomes, myotomes and dermatomes that give rise to the vertebrae of the vertebral column, rib cage, and part of the occipital bone; skeletal muscle, cartilage, tendons, and skin (of the back). The word somite is also used in place of the word metamere.

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What happens in Neurulation?

Neurulation in humans occurs in two distinct phases: primary neurulation during weeks 3 and 4 of gestation leading to development of the brain and spinal cord (Figure 131-3), and secondary neurulation during weeks 5 and 6, with formation of the lower sacral and coccygeal cord.

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What is the definition of Neurulation?

Neurulation refers to the folding process in vertebrate embryos, which includes the transformation of the neural plate into the neural tube. The embryo at this stage is termed the neurula.

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