09 12 07 - Integument I - Background and Fish

09 12 07 - Integument I - Background and Fish - Chapter 6....

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Chapter 6. The Integumentary System Functions: Protection, receives sensory signals, communication, metabolism, body temperature regulation, mineral storage Mostly skin Also appendages- ex) hair teeth feathers I. General Structure 2 basic layers: Epidermis- outer layer Derived from ectoderm Stratum germinativum – basal layer of epidermis Stratum corneum – tough, outer layer - keratin often present No blood vessels Dermis (connective tissue: cells surrounded by the matrix they secrete) Derived form mesenchyme – mesoderm except in the head Largely collagen and elastic fibers Neurons, and blood vessels present Derives from somite -forms ribs muscles and dermatome Neural crest takes over in the head No somites there Pigment cells - Chromatophores Neural crest derived: may be in dermis or epidermis Types: Melanophores (yellowish brown)-melanin Iridophores (reflective) often blue/purple xanthophores (yellow) erythrophores (red) Color change: Morphological - quantity of pigment produced Tanning
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09 12 07 - Integument I - Background and Fish - Chapter 6....

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