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11 Cards in this Set
- Front
- Back
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Blastula
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The stage of an embryo that forms a hollow ball of dividing cells
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Ectoderm
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The outermost of the three germ layers of an embryo that develops into the epidermis and epidermal tissues, the nervous system, external sense organs, and the mucous membranes lining the mouth and anus
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Endoderm
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innermost germ layer of the animal embryo
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Mesoderm
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In an embryo, the middle layer of cells that gives rise to muscles, blood, and various systems.
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body plan
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a term used to describe an animal’s shape, symmetry, and internal organization
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Asymmetrical
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irregular in shape; without symmetry
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Radial Symmetry
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a body plan in which the parts of an animal’s body are organized in a circle around a central axis
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Bilateral Symmetry
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A condition in which two halves of a body mirror each other.
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Cephilization
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The concentration of nerve tissue and sensory organs at the anterior end of an organism
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Coelom
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A fluid-filled space found between the body wall and the digestive tract
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Acoelomates
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An animal that lacks a coelom, or body cavity
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