1.  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.

2. Asymmetry Radial Symmetry Bilateral Symmetry

3. Asymmetrical animals
Sponges

4. Radially Symmetrical Animals
Cnidarians
Coelenterates
Nematodes
Annelids
Ctenophorans
Echinoderms

5. Bilaterally Symmetrical Animals
Platyhelminths
Chordates
Fishes
Herps
Birds
Rotifers
Molluscs
Arthropods
ALLOWS FOR CEPHALIZATION!

6. Directional Orientation
Anterior vs. Posterior
Dorsal vs. Ventral
Medial vs. Lateral
Distal vs. Proximal
Inferior vs. Superior
Cephalic vs. Caudal
Aboral vs. Oral

7. Acoelomate Pseudocoelomate Eucoelomate
Body Plans
Acoelomate
Pseudocoelomate
Eucoelomate

8. Tissue Layer Body Plans
Diploblastic – ectoderm and gastroderm separated by mesoglea
Triploblastic - ectoderm, mesoderm and endoderm
Acoelomate
Pseudocoelomate
Eucoelomate

9. Acoelomate Body Plans
Solid mass of cells between endoderm and ectoderm (parenchyma)

10. Pseudocoelomate Body Plans
Body cavity not entirely lined with mesoderm
Pseudocoelom comes from blastocoel

11. Eucoelomate Body Plans
Cavity completely lined with mesoderm (peritoneum and serosa)
Visceral structures suspended

12. 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.

13. 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