Animal Organization
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Transcript Animal Organization
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.
Symmetry
Asymmetry
Radial Symmetry
Bilateral Symmetry
Asymmetrical animals
Sponges
Radially Symmetrical Animals
Cnidarians
Coelenterates
Nematodes
Annelids
Ctenophorans
Echinoderms
Bilaterally Symmetrical Animals
Platyhelminths
Chordates
Fishes
Herps
Birds
Rotifers
Molluscs
Arthropods
ALLOWS FOR CEPHALIZATION!
Directional Orientation
Anterior vs. Posterior
Dorsal vs. Ventral
Medial vs. Lateral
Distal vs. Proximal
Inferior vs. Superior
Cephalic vs. Caudal
Aboral vs. Oral
Body Plans
Acoelomate
Pseudocoelomate
Eucoelomate
Tissue Layer Body Plans
Diploblastic – ectoderm and gastroderm
separated by mesoglea
Triploblastic - ectoderm, mesoderm
and endoderm
– Acoelomate
– Pseudocoelomate
– Eucoelomate
Acoelomate Body Plans
Solid mass of cells between endoderm
and ectoderm (parenchyma)
Pseudocoelomate Body Plans
Body cavity not entirely lined with
mesoderm
Pseudocoelom comes from blastocoel
Eucoelomate Body Plans
Cavity completely lined with mesoderm
(peritoneum and serosa)
Visceral structures suspended
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.
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