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Questions and Answers
What is the term for the infolding of the cell sheath into the embryo?
What is the term for the infolding of the cell sheath into the embryo?
- Gastrulation
- Morphogenesis
- Invagination (correct)
- Evagination
In which organism is Invagination observed during embryonic development?
In which organism is Invagination observed during embryonic development?
- Sea Urchin (correct)
- Starfish
- Snail
- Frog
What is the resulting layer formed after Invagination in Sea Urchin embryonic development?
What is the resulting layer formed after Invagination in Sea Urchin embryonic development?
- Endoderm (correct)
- Mesoderm
- Blastoderm
- Ectoderm
Which of the following processes is the opposite of Invagination?
Which of the following processes is the opposite of Invagination?
What is the developmental process where Invagination plays a crucial role?
What is the developmental process where Invagination plays a crucial role?
Which process involves the movement of individual cells into the embryo?
Which process involves the movement of individual cells into the embryo?
What is the term for the splitting of one cell sheath into two?
What is the term for the splitting of one cell sheath into two?
Which process results in the expansion of one cell sheath over others?
Which process results in the expansion of one cell sheath over others?
What is the process where the cell sheath intunes over the basal surface of the outer layer?
What is the process where the cell sheath intunes over the basal surface of the outer layer?
Which of the following processes is NOT a type of gastrulation movement?
Which of the following processes is NOT a type of gastrulation movement?
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Study Notes
Invagination in Embryonic Development
- Invagination refers to the infolding of the cell sheath into the embryo.
- Invagination is observed during embryonic development in Sea Urchin.
- After Invagination in Sea Urchin embryonic development, the resulting layer formed is the Archenteron.
- The opposite process of Invagination is Evagination.
- Invagination plays a crucial role in the developmental process of Gastrulation.
Cell Sheath Movements During Embryogenesis
- Invagination: Infolding of cell sheath into the embryo, observed in Sea Urchin endoderm.
- Involution: Inturning of the sheath over the basal surface of the outer layer, seen in Amphibian mesoderm.
- Ingression: Migration of individual cells into the embryo, exemplified by Drosophila neuroblasts and Sea urchin mesoderm.
- Delamination: Splitting of one sheath into two, characteristic of Mammalian development.
- Epiboly: Expansion of one cell sheath over others, observed in Amphibian ectoderm.
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