Term
Superficial, thinner portion
Keratinized stratified squamous epithelial tissue
Provides protection, a barrier |
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Definition
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Term
Deeper, Thicker portion
Connective tissue |
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Definition
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Term
Deep to the dermis
Areolar, adipose tissue
Fat storage, large blood vessels |
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Definition
| Hyperdermis, subcutaneous layer |
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Term
Palms, palmar surfaces of the fingers, soles
Epidermis is relatively thick, 0.6-4.5 mm
Sensory receptors are more dense
Numerous sudoriferous glands, no sebaceous glands |
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Definition
| Thick skin - Hairless skin |
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Term
Everywhere else
Thin epidermis, 0.10 - 0.15 mm |
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Definition
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Term
| Most numerous, produce keratin (a tough protein), waterproofing |
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Definition
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Term
| produce melanin (a brown-black pigment) |
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Definition
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Term
| Small number, immune response |
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Definition
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Term
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Definition
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Term
Deepest Layer
Single row of cells
keratinocytes, some are stem cells that constantly divide
Melanocytes
Merkel cells |
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Definition
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Term
8-10 layers of keratinocytes
Appear spiny in histology slides
Langerhans cells and Melanin granules |
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Definition
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Term
| 3-5 layers of flattened keratinocytes undergoing apoptosis |
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Definition
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Term
| 3-5 layers of clear, flat, dead keratinocytes |
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Definition
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Term
| 25-30 layers of dead, flat keratinocytes that are continuously shed |
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Definition
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Term
THE DERMIS -
One fifth of the dermis
Aerolar connective tissue
Dermal Papillae |
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Definition
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Term
THE DERMIS-
Dense irregular connective tissue
Hair follicles, sudoriferous and sebaceous glands |
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Definition
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Term
PIGMENT -
Protection from UV light
Pale yellow to tan to black
The number of melanocytes is relatively constant, the amount of melanin produced varies
Freckles, age (liver) spots, nevus or mole (benign overgrowth of melanocytes) |
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Definition
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Term
PIGMENT -
Yellow-orange pigment, precursor for vitamin a |
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Definition
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Term
PIGMENT -
Red color, pigment in blood |
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Definition
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Term
SUDORIFEROUS/Sweat Glands:
In most skin
Secretory portion in dermis with pore at surface of epidermis
Helps regulate body temp. |
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Definition
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Term
SWEAT GLANDS -
Found mostly in axilla, groin, areola, beard area in males; don’t function until puberty
Secretory portion in hypodermis with ducts opening into hair follicles
Secretions are similar to that of eccrine sweat glands with the addition of proteins and lipids
Secrete during stress or sexual excitement |
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Definition
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Term
Connected to hair follicles
Secrete sebum, an oily substance
Coats hairs to keep them from drying out
Prevents excessive evaporation of water from the skin
Keeps the skin soft and pliable
Inhibits the growth of certain bacteria |
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Definition
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Term
| Secrete waxy substance that combines with sebum to produce cerumen, earwax |
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Definition
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Term
| Plates of tightly packed, hard, keratinized epidermal cells |
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Definition
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Term
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Definition
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Term
Dermal papilla
Fine touch, pressure, slow vibrations |
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Definition
| Meissner corpuscles (corpuscles of touch) |
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Term
Epidermis
Touch and pressure |
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Definition
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Term
Dermis, ligaments, tendons
Stretching of skin |
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Definition
| Ruffini corpuscles (type II cutaneous mechanoreceptors) |
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Term
Dermis, hypodermis, joints, some viscera
Pressure, fast vibrations, tickling |
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Definition
| Pacinian corpuscles (lamellated corpuscles) |
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Term
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Definition
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Term
WOUND HEALING -
Eliminates microbes, foreign material, dying tissue
Increased permeability, vasodilation
WBCs enter tissue, phagocytize |
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Definition
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Term
WOUND HEALING -
Blood cot dries to scab, Epithelial cells bridge the gap
Fibroblasts synthesize collagen and glycoproteins in the dermis
Granulation tissue = fibrous CT filling the wound
Damaged blood vessels regrow |
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Definition
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Term
WOUND HEALING -
Growth of epithelial cells, fibroblasts deposit collagen, vessels grow |
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Definition
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Term
WOUND HEALING -
Scab sloughs off, granulation tissue becomes scar tissue |
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Definition
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