IntegumentII - The Integumentary System II Announcements...

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The Integumentary System II
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Announcements The most superficial layers of stratum corneum that undergo constant desquamation are stratum disjunctum/ disruptum CORRECT Exam questions for integument lectures will be based on information presented in powerpoint slides
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Glands Sebaceous glands - Release sebum (lipid material) - Acts to coat hair follicles (mammals) - Acts to coat feathers for water resistance (uropygial gland in birds) Sweat glands - Found in mammals (except for aquatic mammals or elephants) - Eccrine, found on skin surface, pads, - Apocrine, found in hair follicles - Primary function is to release fluid and electrolytes - Apocrine originally thought to release a part of cells Unicellular glands -Mucous cells, found in fish, synthesize large molecular weight glycoproteins - Released right onto the fish’s surface, acts to decrease drag and helps with water balance, and has antimicrobial and antiparasitic qualities
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Solid mass of epidermal cells surrounded by connective tissue Sebum= lipids and disintegrated cells Holocrine= entire cell and it’s product Frequently associated with a hair follicle
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Sebaceous glands are large foamy aggregates of cells which release their product (sebum) directly into the base of the hair follicle.
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Apocrine glands most common sweat glands in domestic animals-opens into a hair follicle. They are generally distributed throughout the skin, but only in the horse do they produce actual sweat and function as sweat glands. Merocrine secretion=exocytosis
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Eccrine glands open directly onto the skin surface. These glands are restricted to the foot pads of carnivores, the frog and sole of horses and ruminants and the nasolabial region of ruminants and swine.
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Fish skin has unicellular mucous glands, stained black in the micrograph below.
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Skin Color - Pigmentation • Chromatophores – Melanophores – brown and black in mammals – Xanthophores and erythrophores – yellow and red colors in birds and fish – Iridophores – shiny, red, orange and iridescence in fish and cephalopods Vitamin A – Increased storage results in yellow-orange skin • Erythrocytes – Red blood cells are truly red (hemoglobin pigment) found in blood as well as in chicken combs and wattles
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An example of iridophores from the
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