Quiz #4 Integumentary System PDF

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Download Quiz #4 Integumentary System PDF

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QUIZ #4 Slides from Module 4 for Quiz on 9/20 + Lab 2: Overall Picture (not on quiz)

Layers of the Epidermis

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(1) Stratum Corneum ○ 15-30 layers of dead keratinocytes ○ Lipid coating forms water-resistant layer (2) Stratum Lucidum ○ Layer of dead keratinocytes, only in thick skin ○ Contains translucent protein eleidin (3) Stratum Granulosum

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○ 3-5 rows of keratinocytes ○ Large amounts of keratohyalin are produced (4) Stratum Spinosum ○ 8-10 rows of keratinocytes ○ Accumulation of keratohyalin, lamellar bodies (5) Stratum Basale ○ Single layer of newly-produced cuboidal cells ○ Contains melanocytes and epidermal ridges

Layers of the Dermis

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(1) Papillary Layer ○ Loose connective tissue made up of fine collagen and elastic fibers ○ Associates with epidermis through dermal papillae and epidermal ridges ○ Contains blood/lymphatic vessels and nerves that supply the epidermis ○ Main functions: support epidermis and regulate body temperature (2) Reticular Layer ○ Densely-packed collagen fibers with some elastic fibers interspersed ○ Toughest layer of skin ○ Thick collagen bundles produce cleavage lines (e.g. palm of hand) ○ Contains blood vessels, nerves, and other accessory structures

The Dermis Has Many Important Functions

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Functions of Dermis: ○ (1) Supports epidermis ■ Provides oxygen and nutrients ■ Maintains fluid balance ○ (2) Senses touch, pressure and vibration ■ Meissner’s corpuscles: light touch, pressure, and vibration ■ Lamellated corpuscles: deep pressure and vibration ■ Ruffini corpuscles: pressure and skin distortion ○ (3) Regulates blood flow to skin

The Hypodermis is the Deepest Part of the Integumentary System ● Features of the Hypodermis ○ (1) Classified as “subcutaneous” layer ○ (2) Consists of collagen and elastic fibers, as well as fibroblasts and adipocytes ○ (3) Connects skin to underlying tissue ○ (4) Serves as energy reserve (subcutaneous fat) ○ (5) Contains larger blood vessels and nerves that supply the skin Contraction of the Arrector Pili Muscle and Goosebumps Arrector Pili Muscle Structure...