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5-2. Integumentary System. Comprises of:Skin (Epidermis

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´╗┐Address 5 Integumentary System

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Integumentary System Consists of: Skin (Epidermis & Dermis) Accessory structures Hair Nails Glands Functions Protection Sensation Temperature direction Vitamin D creation Excretion Fig. 5.1

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Epidermis and Dermis Fig. 5.2

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Epidermal Cells Cell sorts Keratinocytes : Produce keratin for quality Melanocytes : Contribute to skin shading (color melanin) Langerhans' cells : Part of the insusceptible framework Merkel's cells : Detect light touch and weight Fig. 5.2 Keratinization : Cells bite the dust and deliver external layer that opposes scraped area and structures porousness layer

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Epidermal Strata Stratum Basale Deepest segment of epidermis and single layer High mitotic movement Stratum Spinosum Limited cell division Stratum Granulosum In shallow layers core and different organelles worsen and cell passes on Fig. 5.2

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Epidermal Strata Stratum Lucidum Thin, clear zone Stratum Corneum Most shallow and comprises of cornified cells Squamous fit as a fiddle, loaded with keratin Fig. 5.2

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Dermis Structural quality Two layers Deeper layer - thick connective tissue; extend marks (striae) Superficial layer underneath epidermis - free connective tissue Fig. 5.6

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Review Question The layer of keratinocyte cells of the epidermis with the most astounding rate of cell division is the Stratum spinosum Stratum basale Stratum corneum Stratum granulosum Stratum lucidum

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Hypodermis Skin lays on this, however not a section Also called Subcutaneous tissue Superficial belt Consists of free connective tissue Types of cells Fibroblasts Adipose (fat) cells Macrophages Subcutaneous fat Fig. 5.6

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Accessory Skin Structures Hair Found wherever on human body with the exception of palms, soles, lips, areolas, parts of outer genitalia, and distal portions of fingers and toes Nails Glands Sebaceous or oil organs Sudoriferous or sweat organs

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Hair Structure Composed of shaft and root Shaft juts above skin surface Root situated beneath surface and base structures the hair knob Hair follicle comprises of layer of dermis and epidermis Arrector pili Smooth muscle Raises hair Fig. 5.9

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Nails Anatomy Nail root proximally Nail body distally: Eponychium or fingernail skin Growth Grow persistently not at all like hair Fig. 5.8

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Oil and Sweat Glands Sebaceous organs Produce sebum Oils hair and skin surface Sudoriferous organs (sweat) Most regularly found in palms, soles and brow Also found in axillae (arm pit), genitalia, around rear-end Ceruminous organs (cerumen or ear wax) Mammary organs Fig. 5.10

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Points to Remember Two segments to integumentary framework Skin (epidermis & dermis) Accessory structures (hair, nails and organs) Keratinization (amassing of keratin) produces upper layer of cells of epidermis, hair and nails Two sorts of organs in skin Sebaceous (sleek) Sudiferous (watery)

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