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Skin. Appendages. Skin Appendages. Hair Nails Glands. 1. Hair. Complete body EXCEPT Lips Nipples Palms Soles of feet. Hair. Shaft = seen above skin Follicle = surrounds hair below surface in epidermis. Hair. Mitosis for hair formation (cells mostly keratin )
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Skin Appendages
Skin Appendages • Hair • Nails • Glands
1. Hair • Complete body EXCEPT • Lips • Nipples • Palms • Soles of feet
Hair • Shaft = seen above skin • Follicle = surrounds hair below surface in epidermis
Hair • Mitosis for hair formation (cells mostly keratin) • Overlap like shingles • Unravel layers = split ends
Hair • Melanocytes - hair color • Melanin with iron = Red hair • Lack of melanin = gray or white hair
Shape of Shaft • Round = Straight hair • Oval = Wavy hair • Flat = Curly hair
Hair • Papilla – supplies blood supply • Alopecia = loss of hair • Genetics
2. Finger Nails • Keratinized cells • Densely-packed • Lunule = Crescent-shaped area of nail • cell growth below lunula
Sweat Glands • Sudoriferous glands • Dermal layer • Salts and wastes • Regulate body temp
Sebaceous Glands • Oil glands • Dermal layer • FX • Keeps hair and skin soft • Prevents water loss