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Follicle
Contains several layers
Sheaths protect and mold the growing hair shaft
Inner sheath - ends at the opening of the sebaceous gland which secrete sebum
Outer sheath - Erector pili muscle attaches to this and causes hair to stand up when it contracts
Papilla
Bulb-like projection
Capillaries nourish the papilla
Shaft - 3 keratin layers
1. Medulla
2. Cortex
3. Cuticle
Pigment cells in cortex and medulla give hair its color
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