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11 Cards in this Set

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