L12 Germ Layers and tissues

Germ Layers and Tissues

Diploblasts

ectoderm and endoderm

Triploblast

ectoderm endoderm and mesoderm

Ectoderm

outer skin

Endoderm

inner skin

Mesoderm

form of muscles, organs, bones

Animal groups recognized as diploblasts

Ctenophora and cndiaria

Cnidaria

Jelly fish corals sea pens hydra and anemones

Ctenophora

Comb jellies

Coelem

fluid filled cavity that lets organs grow and move

How does coelom function

independently of the outer body wall

contractile proteins

Actin and myosin (shared by all animals)

Epitheliomuscular cells

Specialized cells that allows muscles to move without mesoderm

Animals that use Epitheliomuscular cells

Ctenophores and cnidarians