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Chpt 25

TermDefinition
Blastula fluid like ball
Deuterostome mouth developed not from the opening but from cells elsewhere on the gastrula
Ectoderm layer of cells fon the outer surface of the gastrula
Gastrula the strucure made up of 2 layers of cells with an opening at the end
Mesoderm 3rd cell layer found in the developing embryo between the ectoderm & the endoderm
Protostome when opening in the gastrula develops in the mouth
Sessile organisms that are permanently attached to a surface
Acoelomate no body cavities
Anterior head end
Bilateral Symmetry similar on both sides roughly equal halves
Coelom build like space that is completely surrounded by mesoderm
Dorsal upper surface
Endoskeleton internal skeleton
Exoskeleton external skeleton
Invertebrate animal that doesn't have backbone body cavity of an earthworm
Posterior these animals is the tail end
Pseudocoelom fluid-filled body city partly lined with mesoderm
Radial Symmetry can be divided along a plane
Symmetry term that describes the arrangement of body structures
Ventral lower surface
Vertebrate an animal with an endoskeleton & a backbone
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