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12 Cards in this Set
- Front
- Back
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Epidermis is derived from |
Ectoderm |
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Dermis is derived from |
Mesoderm and mesenchyme |
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Which region is made up of subcutaneous layer |
Superficial fascia or hypodermis Made up of losse connective and adipose tissue |
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Which fishes have prominent dermal bone |
Ostracoderm fishes |
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Keratinization |
Produces stratum corneum that helps in reducimg water loss Sauropsids - alpha (soft) and beta (hard) keratinocytes Synapsids - alpha keratinocytes |
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Functions of mucous |
Moisten the skin Ensure laminar flow of water across the body Protect again bacterial infections Makes tish slippery against predators Release toxic repungant chemical |
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Lamprey skin |
Goblet cell absent Dermal bones absent Special cells called thread cells are there |
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Embryonic induction |
The stimulatory effect of dermis upon the epidermis |
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Ecdysis |
Molting is the removal of cornified layer or dead skin of snakes and lizards |
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Gastralia vs Osteoderms |
Gastralia is a collection of dermal bones in abdominal area The region where dermal bone support the epidermis is called osteoderm |
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What are the different types of feathers found in birds? Explain there functions |
Flight feathers are the longest feathers that help in flight. If present at tail then called as retrices and if present at wings then called as reminges Down feather are short feathers for insulation Contour feathers cover the body and provide shape Filoplumes are for display |
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What kind of cells are present in the epidermis of mammals |
Merkel cells that respond to stimulation if mechanoreceptors Langherhans cells play a role in cell mediated actiosn of immune system Chromatophores secrets melanin Keratinocytes are most prominent cells |
