medulla - The marrow of the hair, cortex - Provides strength, shine, colour and texture, cuticle - Provides mechanical strength and protection, hair shaft - The visible, nongrowing portion of the hair, arrector pili muscle - Provides insulation by elevating the hairs, sebaceous gland - Produces sebum, hair follicle - An organ that produces hair, hair papilla - Provides a direct supply of blood, oxygen and nutrients,

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