1 / 119

Integumentary System

Integumentary System. Protection & support Sensory Respiratory (amphibians) Thermoregulation Dissipate heat (blood vessels, sweat) Conserve heat (blood vessels, hair, feathers). Locomotion Water balance Protective coloring, behavior Vitamin D synthesis. Epidermis. Ectodermal derivative

makan
Download Presentation

Integumentary System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Integumentary System • Protection & support • Sensory • Respiratory (amphibians) • Thermoregulation • Dissipate heat (blood vessels, sweat) • Conserve heat (blood vessels, hair, feathers)

  2. Locomotion • Water balance • Protective coloring, behavior • Vitamin D synthesis

  3. Epidermis • Ectodermal derivative • nonvascular

  4. Epidermis • Stratum germinativum • Deeper layer • Mitosis

  5. Epidermis • Superficial layer • Mucus cells (amphibians, fish) • Proteinaceous cells/granular glands • Slime, poisons, enamels, photophores, pheromones • Keratin (cornified, horny, stratum corneum) – Tetrapod feature

  6. Epidermis • Glands are epidermal in origin

  7. Dermis • Dermatome (mesoderm) in origin • Lateral/ventral mesoderm • Neural crest cells for pigment

  8. Dermis • Collagen for strength • Mucopolysaccharides • Elastic fibers • Smooth muscle • Blood and lymph vessels • Follicles and bases of gland

  9. Dermis • Dermis has ancient potential in forming bone as in this ostracoderm!

  10. Hard or Mineralized Tissues • Enamel • Dentin • Bone • Lamellar = Compact • Spongy

  11. Hard tissues • Bone is very primitive dating back to the ostracoderms

  12. Dermis • Chromatophores • Dermal in origin • From neural crest cells • Homeotherms have melanophores & pigment is INJECTED into epidermis • Poikilotherms – the pigment stays in the dermis

  13. Dermis - Chromatophores • Iridophores – silvery & iridescent • Xanthophores – yellow • Erythrophores - red

  14. Fish Skin - Epidermis • Cyclostomes – thin with unicellular mucus glands • Jawed fish – unicellular mucus glands, no keratin!, photophores in some

  15. Fish Dermis • Cyclostomes – no scales • Ostracoderms & Placoderms • Armor shields

  16. Ostracoderm Armor • Lamellar bone • Spongy bone • Dentin(e) • Enamel

  17. Armor Shield • Denticle – Elevations capped with enamel • Protection • Mineral reservoir

  18. Fish Dermis • Cosmoid scales • Modified dentin layer called Cosmine • Extinct sarcopterygians

  19. Fish Dermis • Ganoid scales • Modified thick enamel layer called ganoine • Found in gars

  20. Ganoid scale

  21. Fish Dermis • Placoid scales • Chondrichthyes • Denticle points reduce friction • Ancestor to teeth

  22. Placoid Scales Dentin Pulp Pulp cavity Epidermis

  23. Fish Dermis • Modern scales • Acellular • Thin lamellar bone only • Teleosts and modern sarcopterygians • Annual rings allows aging of fish

  24. Cycloid & Ctenoid Scales

  25. Cycloid scale

  26. Ctenoid scale

  27. Key Points • Give two major characteristics of fish skin.

  28. Amphibians • No scales • Multicellular glands (mucus) • Stratum corneum – keratin – tetrapod feature

  29. Amphibian Epidermis • Thin • Stratum corneum with keratin • Mucus and granular glands

  30. Integument Epidermis Mucus gland Poison gland Dermis

  31. Amphibian Dermis • Firmly attached • May have chromatophores • (Caecilians may have bony dermal scales)

  32. Key Points • Give 2 major characteristics of amphibian skin

  33. Reptile Skin • THICK stratum corneum • Epidermal scales in all • Horny (keratinized)surface structures • Very few glands, dry skin • Some have bony dermal scales or plates

More Related