Презентация на тему: The Integumentary System

The Integumentary System Integumentary System Integument Composition Integument Layers of the Integument (Figure 6.1) Epidermis Epidermal Strata Thick Skin High Magnification Stratum Basale Stratum Spinosum Stratum Granulosum Stratum Lucidum Stratum Corneum Epidermal Strata (Figure 6.2) Variations in the Epidermis Thick Skin Thick Skin High Magnification Thin Skin High Magnification Thin Skin Low Magnification Dermis
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Первый слайд презентации: The Integumentary System

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Слайд 2: Integumentary System

Only 1.5 to 4 mm thick but is body’s largest organ 7% of body weight Provides protection Microbes Dehydration Mechanical damage Contains all four tissue types

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Слайд 3: Integument Composition

Two basic layers Epidermis External Stratified squamous epithelium Dermis Deeper Mostly dense irregular connective tissue Additional layer Hypodermis (subcutaneous) Connective tissue Not really part of integument, but nowhere else to put it!

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Слайд 4: Integument

Epidermis Dermis Subcutaneous layer

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Слайд 5: Layers of the Integument (Figure 6.1)

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Integument Epidermis Dermis Subcutaneous layer Reticular layer Papillary layer Hair shaft Sweat pore Epidermal ridge Dermal papilla Arrector pili muscle Sebaceous (oil) gland Sweat gland duct Merocrine sweat gland Vein Artery Hair follicle Tactile (sensory) receptors Areolar connective tissue Sensory nerve fiber Adipose connective tissue

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Слайд 6: Epidermis

Epithelial tissue arranged in 5 layers or strata Cells divide in only in base layer and are pushed outward Form a keratinized layer on surface Cell division is regulated by growth factor (EGF)

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Слайд 7: Epidermal Strata

From deep to superficial Stratum basale (base layer) Stratum spinosum (spiny layer) Stratum granulosum (grainy layer) Stratum lucidum (light layer or clear layer) Stratum corneum (horny layer)

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Слайд 8: Thick Skin High Magnification

Epidermis Dermis Stratum basale Stratum spinosum Stratum granulosum Stratum lucidum Stratum corneum

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Слайд 9: Stratum Basale

Single layer of cuboidal to low columnar cells attached to a basement membrane Include Keratinocytes Keratin is a tough, water-resistant protein Melanocytes Melanin is a brown protein pigment Transfer melanin to keratinocytes for protection against UV damage Skin color Tactile cells (Merkel cells) Touch receptors

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Слайд 10: Stratum Spinosum

Cells are pushed up from below and become “squished” and look spiny on cross sectional view Spiny appearance comes from connections (desmosomes) between cells Cells are further from blood supply so alive, but not dividing Epidermal dendritic cells Phagocytic immune cells

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Слайд 11: Stratum Granulosum

Cells in this layer start to keratinize (fill with keratin) and look grainy Keratohyalin - precursor to keratin As they go through the process, the organelles in these cells disintegrate Cells die

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Слайд 12: Stratum Lucidum

Keratinocytes with transforming keratohyaline Keratohyaline transforms to clear substance eleidin Found only in thick skin Dead cells

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Слайд 13: Stratum Corneum

20-30 layers of dead keratinocytes Keratin now fully formed C ells are dead Keratinized stratified squamous epithelium Migration process from stratum basale about 2 weeks Remain in stratum corneum for about 2 weeks and then are shed

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Слайд 14: Epidermal Strata (Figure 6.2)

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. LM 25x Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale Dermis (a) (b) Dead keratinocytes Sweat gland duct Living keratinocyte Melanocyte Epidermal dendritic cell Basement membrane Tactile cell Sensory nerve ending Sweat gland duct a: © Ed Reschke/Peter Arnold Images

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Слайд 15: Variations in the Epidermis

Epidermis is not the same over all portions of the body or for all people Thick skin Soles of feet, fingers, toes Has all 5 layers, but no hair follicles or sebaceous glands Thin skin Rest of body Doesn’t have 5 layers, has hair follicles and sebaceous glands

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Слайд 16: Thick Skin

Thin Skin

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Слайд 17: Thick Skin High Magnification

Epidermis Dermis Stratum basale Stratum spinosum Stratum granulosum Stratum lucidum Stratum corneum

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Слайд 18: Thin Skin High Magnification

Epidermis Dermis Stratum basale Stratum spinosum Stratum granulosum Stratum corneum

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Слайд 19: Thin Skin Low Magnification

Epidermis Dermis Dermal papillae Duct of merocrine sweat gland Stratum corneum Stratum granulosum Stratum spinosum Stratum basale

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Последний слайд презентации: The Integumentary System: Dermis

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