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Questions and Answers
What is the term for the solid mass of blastomeres that forms from the cleavage of a zygote?
What is the term for the solid mass of blastomeres that forms from the cleavage of a zygote?
- Archentron
- Morula (correct)
- Blastocyst
- Blastula
Which structure opens to the gut and marks the beginning of invagination?
Which structure opens to the gut and marks the beginning of invagination?
- Archentron
- Blastocoel
- Coelom
- Blastopore (correct)
What is the internal cavity formed after the invagination process in embryonic development?
What is the internal cavity formed after the invagination process in embryonic development?
- Blastocoel
- Blastocyst
- Archentron (correct)
- Morula
What is the primary characteristic of a coelom in an embryo?
What is the primary characteristic of a coelom in an embryo?
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Which structure contains a fluid-filled cavity in the stage of blastula?
Which structure contains a fluid-filled cavity in the stage of blastula?
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Study Notes
Early Embryonic Development
- Morula is a solid mass of blastomeres formed after multiple cleavage events of a zygote.
- Blastopore serves as the opening to the gut where the process of invagination begins.
Cell Division and Properties
- Embryo development involves a few hundred to several thousand cells, with significant increase in total DNA content due to mitosis.
- Each daughter cell nucleus retains the original DNA content of the zygote, classifying these cells as blastomeres.
Key Structures in Embryogenesis
- The blastula is characterized by a cluster of cells known as the blastocyst.
- Archentron is the internal cavity formed following the invagination process during early development.
- Fluid-filled cavity within the blastula is referred to as the blastocoel.
Body Cavities
- Coelom is identified as a body cavity that is completely surrounded by mesoderm, playing a crucial role in the organization of the body plan.
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