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Transcript 
All animals have 3 germ layers
= TRIPLOBLASTIC
Except: sponges, jellyfish, anemones
= DIPLOBLASTIC
Endoderm
Digestive system,
respiratory
Mesoderm Muscle, excretory, bones,
circulatory
Ectoderm
Outer skin, brain,
nervous system
Types of Coeloms (See-Lums)
No cavity (space) around organs
Image from: http://io.uwinnipeg.ca/~simmons/16labman05/lb5pg10.htm
ACOELOM = “without space”
FLATWORMS are
ACOELOMATES!
Types of Coeloms (See-Lums)
Space around organs but only lined with
mesoderm on one side
(lines body wall BUT NOT around gut)
Image from: http://io.uwinnipeg.ca/~simmons/16labman05/lb5pg10.htm
PSEUDOCOELOM
ROUND WORMS are
PSEUDOCOELOMATES!
Kinds of Coeloms (See-Lums)
EUCOELOM: Body cavity (space) lined
on BOTH sides by mesoderm
Image from: http://io.uwinnipeg.ca/~simmons/16labman05/lb5pg10.htm
EUCOELOM = TRUE COELOM = COELOM
EUCOELOMATES
ALL
VERTEBRATES &
MOST
INVERTEBRATES
3 Types of Coeloms
ACOELOM
ectoderm
mesoderm
endoderm
EUCOELOM
PSEUDOCOELOM
Image from: http://www.lander.edu/rsfox/310images/310bil5.jpg
FUNCTIONS of having a
COELOM (body space):
Provides space/cushion internal organs
In animals without a skeletonFluid in coelom space can act as a
HYDROSTATIC skeleton
In animals without blood vesselsFluid in coelom space can circulate
nutrients and oxygen to cells
ADVANTAGE OF a EUCOELOM?
Digestive organ muscles and body wall
muscles come from MESODERM in
different places so organism can digest
food and move at same time.
Images from:
http://www.lander.edu/rsfox/310images/310bil5.jpg
http://www.okc.cc.ok.us/biologylabs/Images/Animal_Images/coelomate.gif
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