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extollo5
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Four features of an animals body plan
- number of embryonic tissue layers
- type of body symmetry and degree of cephalization
- type of body cavity (if any)
- embryo development (dueterostomate, protostomate, etc.)
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diploblast
- 2 tissues
- ectoderm
- endoderm
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triploblast
- 3 tissues
- ectoderm
- mesoderm
- endoderm
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ectoderm
outer tissue layer
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endoderm
inner tissue layer
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mesoderm
middle tissue layer
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3 types of symmetry
- Asymmetry - no symmetry
- Radial Symmetry - multiple planes of symmetry
- Bilateral Symmetry - one plane of symmetry
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bilateral animals also have __________.
heads
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Coelom
"true" body cavity with mesoderm lining both inner and outer layers
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Psuedocoelom
body cavity with mesoderm on outer layer only
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