Skin appendages are derived from downgrowths of epidermal epithelium during development. They include
• Hair follicles and their product, hair
• Sebaceous glands and their product, sebum
• Eccrine sweat glands and their product, sweat
• Apocrine sweat glands and their mixed product
Both hairs and sweat glands play specific roles in regulation of body temperature. Sebaceous glands secrete an oily substance that may have protective functions. Apocrine glands produce a serous secretion containing pheromones that act as a sex attractant in animals and possibly humans. The epithelium of the skin appendages can serve as a source of new epithelial cells for skin wound repair.
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