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
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
Finger Nails
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