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09 14 07 - Integument II

09 14 07 - Integument II - Chapter 6 The Integument II...

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Chapter 6. The Integument II: Tetrapods Stuctures derived from dermal scales: Teeth, Skull bones, pectoral girdle, fin rays Fish: trend towards reduction of dermal armor plates Tetrapods: trend towards elaboration of epidermis Reduction of dermal layer I. Amphibians Lissamphibia Epidermis: thin allowing “cutaneous respiration” water (mucous) on skin needed to facilitate “skin breathing”(cutaneous) Outer cell layers contain keratin – protects against abrasion and desiccation multicellular glands present and mostly secrete mucus begin at surface of epithelial and project down into dermis “Granular glands” – secrete toxins Paratoid glands - Dermis: osteoderms -present in caecilians Portion of dermis comprised of bone Primitive structure Pigmentation – aposematic coloration: “warning coloration”(bright) become associated with toxins among predators Chromophores Cryptic coloration- camouflage Caelicians-some use outer layer of skin (epidermal) as food for offsping II. Reptiles Epidermis: - Have several layers of dead, keratinized epidermal cells forming a thick barrier to air and water. Have epidermal scales Keratin-_________________________________ Hinge region -region between cells with softer keratin - some multicellular glands present for interspecies communication
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  • Spring '07
  • Johnson
  • keratinized epidermal cells, dermal bone epidermis, Amphibians Lissamphibia Epidermis, outer epidermal generation, reptilomorph epidermis Stratum

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09 14 07 - Integument II - Chapter 6 The Integument II...

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