2 INTEGUMENTARY SYSTEM - CHAPTER 5 : An organ - two or more tissues functioning sq. m, 9-11 lbs, 7% of body weight mm thick Two layers & A.Epidermis protective layer w/o B.Dermis tissue fibrous & passes nutrients to by Slide 3 C /subcutaneous layer a lot of tissue that helps skin to 1. Technically of the skin 2. Gives the skin a so it can slide around 3. Heat, shock Slide 4 4 Epidermal Skin Cells I. types of cells A. 90% - contain which is a waterproof that provides the protective qualities 1. Tightly interconnected with 2. develop deep, on l that has actively. stem cells a. cell are pushed by newly produced cells 1
Slide 5 B. Produce pigment granules to keratinocytes from in sun 1. Two forms of melanin: a. & b. 2. Granules migrate - to, sunny side, of keratin cell C. Epidermal /Langerhans cells Immune system cells D. nerve receptors involved w/ sense of 2
Slide 7 II. Epidermis layers ( in thick skin) A. Deep to superficial (apical) 1. (stratum ): Single layer Of cuboidal & columnar stem cells that produce: a. that produces and remain. in the. b. stem cells that produce the that. will to the surface 3
Slide 8 2. : 8-10 layers closely packed cells. Contain long to help retain Slide 9 3. : 3-5 layers of flattened cells containing kinds of. a. Start the process of filling the cells with keratin (protein) b. Waterproof the fluid w/ - between the c. Cause all the cells to this layer to - it becomes a barrier to of & Slide 10 4. *: Clear layer layers a. Thin band of keratinized cells. b. Found only in skin Slide 11 5. : Outermost layer a. of epidermis layers b. Protection: 1. & for waterproofing 2. keratin 3. biological, chemical, physical c. : corn (l) horn (cow horn) 1. Dead cells slough off:. Per life time 2. 4
Slide 12 III. DERMIS A. Strong connective tissue 1.,, and blood cells 2. (ground substance & fibers): binds entire body 3. Plentiful supply: fibers, vessels, glands & follicles B. Two Layers 1. : a. CT looseness enables to region Slide 13 b. : Little that project up the 1. Contain, (pain, soft touch) 2. Some sit on deeper that project Up the Produce for Slide 14 Fig. 5.3 pg. 153 Slide 15 2. : to region a. of dermis b. coarse connective tissue, w/ & fibers ( ) c. leather/ hide C. Subcutaneous Layer/ 1. Not part of dermis/ just deep to it 5
2. Connects dermis to tissues ( ) 3. Areolar & tissue 16 Figure 5.1; pg. 149 Skin Structure Slide 17 of the Skin: a. glands, b. glands, c d. A. Sweat Glands: ( ) almost all over / person Controlled by system to allow body 6
I. Two types A. : Sweat is deposited to skin surface by a 1. high conc., of feet, 2. water- salts, wastes, Slide 18 B. :, (arm pit) & regions 1. Secretion like eccrine plus & substances supports growth - 2. Secretes into Slide 19 Glands ( ) I. Secrete into follicle II. / hair & skin - corpuscles - for deep Slide 20 Hair: A. Function: & B. All of our body palms, soles, lips & genitalia Structure: A. made up of 1. & doesn t flake off B. Shaft projects from skin & is complete C. Root is deep in, where is in process 7
Slide 21 D. Transverse/cross-section 1. concentric layers a. layer w/ large cells, air space & has b. - layers of flattened cells & contains. 1. : yellow, rust, brown & black or (red) made in in of hair Slide 22 C. layer of single, heavily keratinized, ( ) cells 1. Heavy keeps hair & compacted 2. Keeps hairs not matted 3. Wears at end 2. Cross Section a. Flat kinky/ curls b. Oval c. Round - 8
Slide 23 Figure 5.6 Hair & Follicle Structure Slide 24 Hair : (folli (l) = ) 1. Extends into epidermis & dermis, into scalp 2. The follicle base ( ) contains a, with to hair cell production 3. (modified dermal papillae) is covered with 9
, which are the actively hair producing cells 4. Hair follicle walls consist of (epidermal) & - (epidermal) sheaths Slide 25 Figure 5.6 pg. 158-Structure of hair & follicle 10
Slide 26 Hair follicle receptor If hair is disturbed, the follicle is also -this acts as a which is consciously. muscle connects to the hair follicle If the muscle it the hair. Creates more for better /heat retention Hair on back of neck, bumps responding follicles Slide 27 Figure: 5.1; page: 149 11
Slide 28 D. : Hard,, scale like epidermis modification for Correspond to I. Structure A. : Visible part of nail pinkish, underlying 1. : distal aspect 2. : buried under proximal nail fold of 3. : epidermal cells for nail nail slides forward Slide 29 4. : ( tissue) is so vascular tissue doesn t show through 5. : epidermis under the nail body 6. (eponychium): part of proximal nail fold lying on proximal nail body 7. /quick: dirty finger nails 12
Slide 30 Figure 5.7 pg. 160: Structure of Nail 13
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