Page 1. Chapter 5 Integumentary System. Integument Function: 1) Protection: 3) Sensation: 4) Excretion & Secretion. 2) Thermoregulation:
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1 1 Chapter 5 Integumentary System Marieb & Hoehn Figure 5.1 Integument Function: 1) Protection: a) Physical (e.g., cuts, abrasions, tears) Tough: Keratinized cells Stretchy: Elastic / collagen fibers Bouncy: Adipose tissue (shock absorption) b) Chemical Impermeable (non-porous) c) Biological (e.g., bacteria) Arid / low nutrient surface Acid / antibody secretions d) Environmental (e.g., UV radiation) Melanin (pigment) 2) Thermoregulation: Adipose tissue (insulation) Vascular perfusion Sweat glands 3) Sensation: Pain (nociceptors) Touch (light vs. heavy pressure) 4) Excretion & Secretion Salts, water, waste (sweat glands) Milk (mammary glands) Page 1
2 2 Anatomy of Integument: 1) Cutaneous Membrane (Skin): Marieb & Hoehn Figure 5.1 Epidermis Dermis Hypodermis Subcutaneous layer Attach skin to muscle / bone Anatomy of Epidermis: Callus: Epidermis thickening due to repeated friction Epithelial tissue (stratified squamous) Avascular (i.e., no blood vessels) Function = Protection Thin vs. thick skin Cell Types Present: 1) Keratinocytes (most common) keratin 2) Melanocytes Melanin (skin pigment) 3) Langerhans cells Macrophages (defense) 4) Merkel cells (touch receptors) Page 2
3 3 Anatomy of Epidermis: Layers (Strata): 1) Stratum Basale (Germinativum): Innermost layer Form epidermal ridges Fingerprints (unique) Actively dividing cells (basal cells) Melanocytes Merkel cells 2) Stratum Spinosum: Cells connect (desmosomes) Langerhan s cells Anatomy of Epidermis: Layers (Strata): 3) Stratum Granulosum: Organelles disintegrate protein / enzyme content Keratin production Glycolipids (water resistant) 5) Stratum Corneum: Outermost layer Insensible perspiration 4) Stratum Lucidum: Only present in thick skin Dead, keratinized cells Constantly shed (40 lbs. / lifetime) Keratinocyte Life Span: ~ 6 weeks Page 3
4 4 Epidermal Characteristics : 1) Relatively impermeable (keratin & glycolipids) Oils / lipids can penetrate epidermis (slowly) 2) Colored: a) Pigments Poison Oak Carotene (orange-yellow) : Accumulates inside cells Melanin (brown; yellow-brown; black): Produced by melanocytes Nicotine Patch Page 4
5 5 Melanocytes: All individuals have similar # of melanocytes Variation = quality / quantity of melanin Albinism = lack of melanin Faulty enzyme (Tyrosinase) Freckle: Local accumulation of melanin Protects against UV radiation Tan = Melanin production enhanced by UV light (enters neighboring cells) levels UV light beneficial: Cholesterol (Modified) Sunlight Vitamin D Calcium Uptake levels UV light detrimental: Most common Skin Cancers (DNA damage) Most dangerous Basal Cell Carcinoma (stratum basale) Sqamous Cell Carcinoma (stratum spinosum) Melanoma (Melanocytes) Page 5
6 6 Epidermal Characteristics : 1) Relatively impermeable (keratin & glycolipids) Oils / lipids can penetrate epidermis (slowly) 2) Colored: a) Pigments Poison Oak Carotene (orange-yellow) : Accumulates inside cells Melanin (brown; yellow-brown; black): Produced by melanocytes b) Dermal circulation: Blood vessels under skin = Pinkish tint (hemoglobin) Cyanosis = Low blood oxygen level (dark red blood) Nicotine Patch Perioral cyanosis Peripheral cyanosis Diseases Associated with Skin Pigmentation : 1) Jaundice: Accumulation of yellowish pigment (bilirubin) Liver malfunction (does not secrete bile) 2) Pituitary Tumor: Overproduction of melanocyte-stimulating hormone 3) Addison s Disease: Overproduction of adrenocorticotropic hormone Mimics melanocyte-stimulating hormone 4) Vitiligo: Loss of melanocytes (autoimmune disease) Page 6
7 7 Anatomy of Integument: 1) Cutaneous Membrane (Skin): Marieb & Hoehn Figure 5.1 Epidermis Dermis Hypodermis Subcutaneous layer Attach skin to muscle / bone Anatomy of Dermis: Dermal papillae 1) Papillary Layer (superficial): Loose connective tissue Supports / nourishes epidermis Capillaries; nerves 2) Reticular Layer (deep): Dense, irregular connective tissue Collagen fibers: strength Elastic fibers: stretch / recoil Stretch marks Blister: Dermis / epidermis separation Tattoos: Ink placed in dermis Cleavage Lines (Surgical importance) Page 7
8 8 Burns: Tissue damage inflicted by heat, electricity, chemicals, radiation Severity = Depth of Damage Burn (tissue damage) 1st Degree Epidermis Perfusion Water / electrolyte loss 2nd Degree Epidermis & dermis Blisters blood pressure Circulatory Shock 3rd Degree Epidermis, dermis & hypodermis Marieb & Hoehn Figure 5.1 Anatomy of Integument: 1) Cutaneous Membrane (Skin): 2) Skin Appendages: Page 8
9 9 Skin Appendages: 1) Sweat Glands (merocrine 3 million / person): A) Produce sweat (water, salts, waste - acidic) a) Eccrine sweat glands: Widely distributed (palms / soles / forehead) Cool body (perspiration - 1 gal / hour) b) Apocrine sweat glands: Axillary & genital regions (hair follicle) Odor = bacterial breakdown B) Produce cerumen (i.e., earwax) Ceruminous glands: Ear canal; produce sticky, bitter substance Protection against insects / foreign matter C) Produce milk (nutrition for offspring) Mammary glands: Breast (females / males) Nutrition for developing offspring Skin Appendages: 2) Sebaceous Glands (holocrine): Secrete oily substance (sebum) Hair follicles (structure = simple branched alveolar) Lubricates hair shaft; antibacterial (acidic) Pimple = Blocked, infected gland 3) Hairs (pili - ~ 2.5 million / body): Fused, keratinized cells Composed of shaft & root Hair appearance = shaft shape Color = variation in melanin Produced by hair follicles Growth: 2 5 years (0.3 mm / day) Vellus Hairs: Peach fuzz Terminal Hairs: Course hair Roots set deep in dermis / hypodermis Page 9
10 Marieb & Hoehn Figure 5.6 Skin Appendages: 3) Hairs (pili - ~ 2.5 million / body): Function: 4) Nails: 1) Scalp: protection & insulation 2) Body: hair plexi Sensation (e.g., insect detection) Insulation (arrector pili = muscles) 3) Ears / Nose / Eye: Protection (trap particles) Hair growth affected by age, stress and diet (e.g., alopecia) Keratinized, dead cells (body of nail) Nail root = site of growth Marieb & Hoehn Figure 5.7 Page 10 10
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