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15 Cards in this Set

  • Front
  • Back
Skin Functions
• Cushions and insulates deeper organs
• Protects body from bumps, scrapes, and cuts
• Protects body from chemicals, heat, and cold
Layers of Epidermis
Stratum basale (stratum geminativum)
Stratum spinosum
Stratum granulosum
Stratum lucidum (only in thick skin)

Stratum corneum
Layers of Dermis
•Papillary layer – includes dermal papillae

•Reticular layer – deeper layer – 80% of thickness of dermis
Keratinocytes
• Keratinocytes – most abundant cell type in epidermis
• Arise from deepest layer of epidermis
• Produce keratin – a tough fibrous protein
• Produce antibodies and enzymes
• Keratinocytes are dead at skin's surface
Pigments
• Melanin – most important pigment – made from tyrosine
• Carotene – yellowish pigment from carrots and tomatoes
• Hemoglobin – Caucasian skin contains little melanin
• Allows crimson color of blood to show through
Sebaceous Glands
Sebaceous Glands
•Occur over entire body, except palms and soles
•Secrete sebum – an oily substance
•Simple alveolar glands
•Holocrine secretion – entire cell breaks up to form secretion
•Most are associated with a hair follicle
•Functions of sebum
• Collects dirt; softens and lubricates hair and skin
Two types of sweat gland
Eccrine gland
•Most numerous – produce true sweat

Apocrine gland
•Confined to axillary, anal, and genital areas
•Produce a special kind of sweat
Thick vs Thin skin
•Stratum lucidum layer
(only in thick skin)
Tissues of Dermis & epidermis develpo from
•Epidermis develops from embryonic ectoderm

•Dermis and hypodermis develop from mesoderm
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