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Today’s Objectives
TSW be able to recognize and give examples of the three types of symmetry found in animals.
TSW be able to properly use directional terms for anatomical position.
TSW be able to draw the three types of triploblastic body plans.
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Symmetry
Asymmetry
Radial Symmetry
Bilateral Symmetry
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Asymmetrical animals
Sponges
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Radially Symmetrical Animals
Cnidarians Coelenterates Nematodes Annelids Ctenophorans Echinoderms
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Bilaterally Symmetrical Animals
Platyhelminths Chordates Fishes Herps Birds Rotifers Molluscs ArthropodsALLOWS FOR CEPHALIZATION!
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Directional Orientation
Anterior vs. Posterior Dorsal vs. Ventral Medial vs. Lateral Distal vs. Proximal Inferior vs. Superior Cephalic vs. Caudal Aboral vs. Oral
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Body Plans
Acoelomate
Pseudocoelomate
Eucoelomate
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Tissue Layer Body Plans
Diploblastic – ectoderm and gastroderm separated by mesoglea
Triploblastic - ectoderm, mesoderm and endoderm– Acoelomate– Pseudocoelomate– Eucoelomate
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Acoelomate Body Plans
Solid mass of cells between endoderm and ectoderm (parenchyma)
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Pseudocoelomate Body Plans
Body cavity not entirely lined with mesoderm
Pseudocoelom comes from blastocoel
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Eucoelomate Body Plans
Cavity completely lined with mesoderm (peritoneum and serosa)
Visceral structures suspended
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Review Items
Draw each type of triploblastic body plan and label each germ layer.
Name at least one phylum of animals that falls into each category of symmetry.
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Anatomical Position Review
Use the proper terms to describe the relationship between the following body parts:– A) hand is ____ to the elbow– B) knee is ____ to the head– C) bellybutton is ____ to the spinal cord– D) heart is ____ to the lungs– E) head is ____ to the neck (2 terms fit here)– F) wrist is ____ to the fingers