Sweat glands : Apocrine sweat gland Eccrine sweat gland Sebaceous. Each strand of hair is made up of the medulla , cortex , and cuticle. These hairs then form a heat-trapping layer above the epidermis. Skin and related structures. Archived from the original on 16 December This argument assumes that curly hair better impedes the passage of UV light into the body relative to straight hair thus curly or coiled hair would be particularly advantageous for light-skinned hominids living at the equator. Therefore, evidence of the time when human skin darkened has been used to date the loss of human body hair, assuming that the dark skin was needed after the fur was gone. Coarse hair feels hard and wiry.
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