General

Table of Granulomas

Skin Appendages

Skin appendages are specialized structures derived from the epithelial cells of the epidermis that project down into the underlying dermis. They are integral components of the integumentary system.

• Hairs: Skin Appendage. Hair follicles are invaginations of the epidermis. They play a key role in thermal regulation, sensory perception, and protecting the skin.
• Sebaceous glands: Skin Appendage. These are exocrine glands typically attached to hair follicles. They secrete an oily, waxy substance called sebum that lubricates and waterproofs the skin and hair.
• Nails: Skin Appendage. Nails are hard plates of tightly packed, heavily keratinized epithelial cells that develop from the nail matrix at the distal phalanges, serving a protective function.
• Mucous glands: Not a Skin Appendage. Mucous glands are found in mucous membranes (mucosa), which line internal body tracts exposed to the exterior (such as the respiratory, digestive, and urogenital tracts). The skin, by definition, is a dry, keratinized cutaneous membrane and does not naturally contain mucous-secreting glands.

MYC