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22 Cards in this Set
- Front
- Back
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The very ealy series of divisions of an embryo. It generally includes all of the embryonic stages up through the blastula stage.
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Cleavage
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What is the embryo called during the early divisions when it is a solid ball of cells (around the 16-32 stage)?
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Morula
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Which stage begins at the 32+ cell stage?
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The Blastula Stage
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The blastula stage is characterized as being a what?
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Hollow ball of cells
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Sometimes the cavity of the blastula is filled or partially filled with what?
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Yolk
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The single layer of cells composing the outside of the blastula is called what?
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The Blastoderm
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The inner hollow area of the blastula is called what?
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The Blastocoel
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After the addition of many thousands of cells to the blastula what is formed?
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The Gastrula
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What is the opening that the gastrula is characterized by called?
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The Blastopore
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What happens at the newly formed blastopore?
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Cells move to the inside of the embryo.
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What are the three recognizable embryonic tissue layers of vertebrates in the gastula stage?
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1-ectoderm
2-endoderm 3-mesoderm |
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Which skin layer is on the outside?
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Ectoderm
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What will the ectoderm eventually form?
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1-Skin
2-Nervous System |
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Which skin layer is found on the inside?
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Endoderm
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What does the endoderm eventually form?
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The inner lining of the digestive system and of some digestive organs.
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Which layer of skin is found in between the other two?
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Mesoderm
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What will the mesoderm eventually form?
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Many of the organism's larger structures like muscles, bones, and cartilage, etc.
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What is the cavity of the gastrula called and what is it lined by?
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The gastrocoel
The endoderm |
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What are two other names for the gastrocoel?
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1-Archenteron
2-"Primitive Gut" |
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Where does the mouth form in lower animals (like most invertebrates)?
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At the blastopore
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What is another name for mouth?
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Stomodeum
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Where does the mouth develop in more advanced animals such as al vertbrates and echinoderms?
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Blastopore
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