Ch. 5 Integument - Integument 1 Structure of the Skin...

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Integument 1
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Structure of the Skin Covers surface of body(epidermis , dermis) Largest organ of the body Size (22 square ft) Weight (10-11 lbs.) Thickness varies Thin skin - .5 mm (eye lids) Thick skin - 4 mm (heel, palm, sore) 2
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Structure of the Skin Epidermis Superficial Thin Composed of keratinized stratified squamousal epithelial tissue (makes up the epidermis) 4 types of cells Keratinocytes Melanocytes Langerhands cells Merkel cells 4
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Structure of the Skin Keratinocytes Produce keratin Protects skin and underlying tissues from heat , microbes , and chemicals Releases water-repellent sealant to decrease water entry and loss 5
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Structure of the Skin Melanocytes Produce melanin Yellow/red or brown/black pigment Absorbs UV light Shields nucleus from damage 6
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Structure of the Skin Langerhans cells (intraepidermal macrophage cells) Arise from red bone marrow Migrate to epidermis Provide immune response towards microbe invaders Damaged by UV light 7
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Structure of the Skin Merkel cells (tactile epithelial cells) Found in deepest layer of epidermis Attach to Merkel disk (sensory neuron) Detect light pressure 8
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Structure of the Skin Thick Skin Stratum C orneum Stratum L ucidum Stratum G ranulosum Stratum S pinosum Stratum B asale (attached to the dermis) ` 9
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Table 5.1 11
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Structure of the Skin Thin Skin Stratum C orneum Stratum L ucidum Stratum G ranulosum Stratum S pinosum Stratum B asale 12
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This note was uploaded on 02/01/2011 for the course BIOL 1604 taught by Professor Allen during the Spring '03 term at Tulsa Community College.

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Ch. 5 Integument - Integument 1 Structure of the Skin...

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