Podcast
Questions and Answers
Which process involves cells reorganizing to form less layers allowing the cells to extend out from a point?
Which process involves cells reorganizing to form less layers allowing the cells to extend out from a point?
- Invagination
- Epiboly
- Convergent Extension (correct)
- Involution
Which germ layer forms the epithelial linings of the respiratory and digestive tracts, including the glandular cells of the liver and pancreas?
Which germ layer forms the epithelial linings of the respiratory and digestive tracts, including the glandular cells of the liver and pancreas?
- Ectoderm
- Mesoderm
- Endoderm (correct)
- None of the above
Which structure is formed from the mesoderm?
Which structure is formed from the mesoderm?
- Sensory epithelium of ear
- Liver stroma (correct)
- Parenchyma of thyroid
- Epidermis
Which process involves a tissue layer folding in or out?
Which process involves a tissue layer folding in or out?
Which germ layer gives rise to the central nervous system and peripheral nervous system?
Which germ layer gives rise to the central nervous system and peripheral nervous system?
Which structure is NOT formed from the mesoderm?
Which structure is NOT formed from the mesoderm?
Which process occurs during gastrulation?
Which process occurs during gastrulation?
What are the three tissue layers produced by gastrulation called?
What are the three tissue layers produced by gastrulation called?
Which layer forms the outer layer of the gastrula?
Which layer forms the outer layer of the gastrula?
What lines the embryonic digestive tract?
What lines the embryonic digestive tract?
What is the process by which the bilaminar embryonic disc is turned into the trilaminar embryonic disc?
What is the process by which the bilaminar embryonic disc is turned into the trilaminar embryonic disc?
What is an important process occurring during gastrulation besides formation of the primitive streak?
What is an important process occurring during gastrulation besides formation of the primitive streak?
During which week of development does the primitive streak form?
During which week of development does the primitive streak form?
What does the notochord act as during embryo development?
What does the notochord act as during embryo development?
What happens to the process of forming mesoderm through the primitive streak after the second week?
What happens to the process of forming mesoderm through the primitive streak after the second week?
What are oropharyngeal membrane and cloacal membrane examples of during embryonic development?
What are oropharyngeal membrane and cloacal membrane examples of during embryonic development?
What is the role of the primitive streak during gastrulation?
What is the role of the primitive streak during gastrulation?
Which movement involves layers separating as sheets during embryonic development?
Which movement involves layers separating as sheets during embryonic development?
What is formed by invagination of cells from the primitive pit?
What is formed by invagination of cells from the primitive pit?
What does gastrulation lead to in terms of cell migration?
What does gastrulation lead to in terms of cell migration?
What is the function of mesoderm in embryonic development?
What is the function of mesoderm in embryonic development?
Which structure serves as a foundation for the vertebral column?
Which structure serves as a foundation for the vertebral column?
Flashcards
Convergent Extension
Convergent Extension
A process where cells reorganize to form fewer layers, allowing cells to extend outwards from a point.
Endoderm
Endoderm
The innermost germ layer that forms the epithelial linings of the respiratory and digestive tracts, including the glandular cells of the liver and pancreas.
Invagination (Evagination)
Invagination (Evagination)
A process where a tissue layer folds inwards or outwards.
Ectoderm
Ectoderm
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Mesoderm
Mesoderm
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Gastrulation
Gastrulation
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Embryonic Germ Layers
Embryonic Germ Layers
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Ectoderm
Ectoderm
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Endoderm
Endoderm
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Gastrulation
Gastrulation
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Notochord
Notochord
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Second Week
Second Week
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Notochord
Notochord
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Slows Down and Degenerates
Slows Down and Degenerates
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Oropharyngeal Membrane and Cloacal Membrane
Oropharyngeal Membrane and Cloacal Membrane
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Primitive Streak
Primitive Streak
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Delamination
Delamination
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Notochordal Canal and Notochord
Notochordal Canal and Notochord
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Cell Migration to Form Germ Layers
Cell Migration to Form Germ Layers
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Mesoderm Function
Mesoderm Function
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Notochord
Notochord
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Study Notes
- The mesoderm is a layer of cells that partly fills the space between the endoderm and ectoderm, contributing to the development of muscles and the reproductive system.
- During the third week of development, a thickened linear band of epiblast on the dorsal caudal aspect of the embryonic disc forms, leading to the development of the primitive node, primitive pit, and primitive groove.
- The process of forming mesoderm through the primitive streak slows down after the second week and degenerates in the sacrococcygeal region of the embryo.
- The oropharyngeal membrane and cloacal membrane are two faint depressions that appear in the ectoderm during the third week.
- The notochordal process elongates by invagination of cells from the primitive pit, forming a notochordal canal and a notochord.
- The notochord is a key structure that acts as a rigid axis around which the embryo develops, serving as a foundation for the vertebral column and inducing the formation of the neural tube (future nervous system).
- During development, cells undergo various movements and rearrangements, including ingression (cells breaking away as individuals), delamination (layers separating as sheets), and intercalation (layers connecting with each other).
- Gastrulation begins when cells of the epiblast migrate to the median plane of the dorsum of the embryonic disc, with the primitive streak defining the body axis (rostrocaudal and left-right) and leading to the formation of the notochord.
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Description
Test your knowledge of gastrulation and embryonic tissue origins with this quiz. Identify the embryological differences of gastrulation and learn about the origins of various embryonic tissues.
