External Anatomy I Lecture 10. Exoskeleton. Major synapomorphy for Arthropoda. Cuticle : skeletal structure composed of chitin and protein comprising several differentiated layers. Exoskeleton – external protection and support Apodemes – internal support and muscle attachment
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Epidermis + Cuticle = Integument
Procuticle = Exocuticle (thin) + Endocuticle (thick)
Tergum: dorsal plate, tergite
Sternum: ventral plate, sternite
Pleuron: side plate, pleurite
(membrane in abdomen, sclerotized in thorax)