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A&P I Chapter 5 Lect

Integumentary System

What is the largest system of the body? Integumentary System
What are the two major parts of integumentary system? Cutaneous membrane Accessory structures
What are the components of cutaneous membrane? Outer epidermis (superficial epithelium) Inner dermis (connective tissues)
Originate in the dermis Extend through epidermis to skin surface ie. hair and hair follicles, exocrine glands, nails Blood vessels, sensory receptors Accessory structures
Loose connective tissue Below the dermis Subcutaneous layer (hypodermis)
Protects the dermis, prevents water loss and the entry of pathogens. Synthesizes vitamin D. Sensory receptors detect touch, pressure, pain, and temperature. Epidermis
Nourishes and supports epidermis Papillary Layer
Has sensory receptors that detect touch, pressure, pain, vibration, and temperature. Blood vessels assist in thermoregulation. Reticular Layer
Hairs protect skull and provide delicate touch sensations on general body surface. Hair follicles
Assist in temperature regulation and waste excretion. Exocrine glands
Protect and support tips of fingers and toes Nails
The body's most abundant epithelial cells. Contain large amounts of keratin. Keratinocytes
Covers most of the body. Has four layers of keratinocytes. Thin skin
Covers the palms of hands and soles of feet. Has five layers of keratinocytes Thick skin
What are the five layers of keratinocytes in thick skin? Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale
Located between epidermis and subcutaneous layer. Anchors epidermal accessory structures Two component: Outer papillary layer, Deeper reticular layer Dermis
Consists of areolar tissue Contains capillaries, lymphatic vessels, and sensory neurons Becomes inflamed in dermatitis Papillary Layer
Consists of dense irregular connective tissue Contains collagen and elastic fibers. Reticular Layer
Very strong, resist stretching Easily bent or twisted Limit flexibility to prevent tissue damage Collagen fibers
Permit stretching and then recoil to original length. Provide flexibility Elastic fibers
Fibers and water provide flexibility and resilience Skin turgor
Deep network of arteries along the reticular layer Cutaneous plexus
Network of small arteries in papillary layer. Capillaries drain into small veins that lead to larger veins in subcutaneous layer. Subpapillary plexus
Caused by damage to blood vessels in dermis Contusion (bruise)
Involuntary smooth muscle Contraction causes hairs to stand up Produces "goose bumps" Arrector pili muscle
What are the two exocrine glands in skin? Sebaceous glands (oil) Sudoriferous (sweat)
Sweat glands found in armpits, around nipples, and in pubic region. Apocrine
Sweat glands that discharge directly onto skin surface. Cooling surface of skin to reduce body temperature Eccrine
Glands that produce milk Mammary
Glands that produce cerumen (earwax) Ceruminous
Created by: jannparker