Chap5_2401 - Chapter 5 1 THE INTEGUMENTARY SYSTEM Chapter 5...

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C h a p t e r 5 1 THE INTEGUMENTARY SYSTEM Chapter 5 Anatomy and Physiology Lecture
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C h a p t e r 5 2 THE INTEGUMENTARY SYSTEM Integumentary System – Consists of the skin and accessory structures such as hair , nails , and glands . Integument means covering. Overview of the Integumentary System Major Functions of the Integumentary System 1. Protection 2. Sensation 3. Temperature regulation 4. Vitamin D production 5. Excretion HYPODERMIS Hypodermis – Attaches the skin to the underlying bone and muscles and supplies it with blood vessels and nerves. Main types of cells within the hypodermis are fibroblast, adipose cells, and macrophages. Subcutatneous tissue of Superficial fascia – Hypodermis that is not part of the skin. SKIN Skin is one of the largest organs of the body in terms of surface area and weight. Dermatology - is the medical specialty that deals with the diagnosis and treatment of skin disorders.
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C h a p t e r 5 3 Two Major Tissue Layers of Skin : a. Epidermis - The outer, thinner portion, composed of stratified squamous epithelium (epithelium). Lack blood vessels, lymphatic vessels, and connective tissue. b. Dermis - The inner, thicker portion, composed of connective tissue. DERMIS Dermis is the second principal part of the skin, composed of connective tissue containing collagenous and elastic fibers. Collagen - a protein, the main organic constituent of connective tissue. a. Papillary Region or Layer . Upper region of the dermis. -Consists of loose (areolar) connective tissue containing fine elastic fibers. -Its surface area is greatly increased by small, fingerlike projections called Dermal Papillae . Dermal Papillae project into the epidermis, and may contain loops of capillaries. -Some dermal papillae also contain corpuscles of touch , also called Meissner's Corpuscles , nerve endings that are sensitive to touch. b. Reticular Region or Layer . Remaining portion of the Dermis. -Consists of dense, irregularly arranged connective tissue containing interlacing bundles of collagenous and coarse elastic fibers . -Combination of collagenous and elastic fibers in the reticular region
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C h a p t e r 5 4 provides the skin with strength , extensibility , and elasticity . Extensibility is the ability stretch. Elasticity is the ability to return to original shape after extension or contraction. *(Ability of the skin to stretch can readily be seen during conditions of pregnancy, obesity, and edema.) *(The small tears that occur during extreme stretching are initially red and remain visible afterward as silvery white streaks called striae .) -Reticular region is attached to underlying organs, such as bone and muscle, by the subcutaneous layer , also called Hypodermis or superficial fascia.
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Chap5_2401 - Chapter 5 1 THE INTEGUMENTARY SYSTEM Chapter 5...

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