Chapter_6 - The Skin Cutaneous Membrane The Integumentary...

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8/30/2009 1 Cutaneous Membrane: The Integumentary System The Skin Epidermal Strata (Layers) Stratum Basale/Germinativum Undergoes constant mitosis to replace exfoliated cells Cells die as they move upwards ( why? ), and their cytoplasm is replaced by the protein keratin As keratinized cells reach the outermost layer they become hard & flattened the stratum corneum Melanin What is melanin? Helps protect the deeper layers of the skin from the harmful effects of the sun’s ultraviolet (UV) rays Patches of melanin in the skin Malignant melanocytes ? Sun exposure   melanin production to protect the skin from UV rays, producing a suntan Stratum Corneum Outermost protective layer of keratinized cells; responsible for: waterproofing of the skin, protection against infection, and What is exfoliation?
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8/30/2009 2 The Dermis (Corium) • The true skin Elastic connective tissue Contains most of the accessory structures of the skin, such as? Hypodermis (Sub-cutaneous Layer) Loose connective tissue Contains adipose tissue for insulation & as an energy source Skin Accessories: Sebaceous (Oil) Glands Found everywhere on the skin except the palms, soles & back of feet Ducts open into hair follicles Produce a variety of secretions Sebum (oil) Vernix caseosa? Eye lubrication Sebaceous Gland Disorders Blackheads Pimples Sebaceous Cysts – A mixture of dried sebum & keratin collected at the opening of the glands Infected sebaceous glands Blocked sebaceous gland a sac of accumulated sebum which may increase in size Sudoriferous (Sweat) Glands Located in the dermis and subcutaneous tissue, include Eccrine sweat glands Apocrine sweat glands Ceruminous glands Ciliary glands Mammary glands Sudoriferous (Sweat) Glands Eccrine glands Over the entire skin surface Excretory duct opens at a skin pore Regulate body temperature Apocrine glands
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Chapter_6 - The Skin Cutaneous Membrane The Integumentary...

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