09 14 07 - Integument II

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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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 - Epidermis consists of 3 basic layers
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/16/2008 for the course BIOL 276 taught by Professor Johnson during the Spring '07 term at UNC.

Page1 / 4

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online