Chapter 6 Flashcards
Avascular
Interface between organism and environment
Non-living coverings
1. Mucus
2. Stratum corneum
Derived from ectoderm
Epidermis
Secret mucus
Goblet cells
Fish epidermal glands
Goblet cells, granular cells, few multicellular glands, photo phones in deep sea telesots
Aquatic amphibians epidermis
Multicellular mucus or granular glands, moistens skin in air, assist function of epidermis as respiratory membrane
Merocrine
Secrete via cell membrane, cells remain intact human sweat glands
Holocrine
Cells are the secretion
Avian oil glands and mammalian sebaceous glands
Apocrine
Material in apical region plus some cytoplasm pinches off
Mammary glands
Goblet cells
Mucus oozes from ruptured cell apex
Several rounds of repair then is discarded
Present in amphibians and reptiles not in birds and mammals
Toxic alkaloids
Phermones
Granular
Uropygeal gland
Water repellent product
Avian oil glands
Alveolar
Secrete oily sebum into hair follicles
Sebaceous
Coiled tubular sweat glands in mammals
Invaginate deep into dermis
Sudiferous
Sebaceous and sudiferous glands -> phermones
Scent glands
Modified sebaceous
Develop from ectodermal milk lines
Spread beneath dermis
Mammary gland
Site of keratinization protect against dessication
Improved thermoregulation
Defense
Stratum corneum
Repitious thickening of stratum corneum
Squamates= overlapping folds
Present in birds where feathers are missing
Epidermal scales
First appeared in reptiles
Persisted in birds and mammals
Unguis and subunguis
Claws hoofs and nails
Cover most of body but follicles are disposed in feather tracks
Contour feathers
Small, fluffy
Underneath and between contour
Down feathers
Hairlike
Scattered among contour
Filoplumes
Basic component is collagenous connective tissue
Mesoderm derived
Dermis
