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Arrector pili muscle
Small involuntary muscle “goosebumps”
Sebaceous Glands
Oil glands in the skin connected to hair follicle
Sebum
Fatty oily substance that comes from sebaceous glands
Hair cuticle
Outermost layer of the hair, single overlapping layer of transparent, scale like cells: acts as a barrier
Hair cuticle
Cortex
Middle layer fibrous protein core formed by elongated cells contains melanin pigments 90% of hair weight, elasticity, and natural color
Note 
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