Anatomy and Cell Biology 3309 Lecture Notes - Lecture 14: Desquamation, Autonomic Nervous System, Arrector Pili Muscle
23 Jan 2017
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Skin appendages are so-named because they are derived from downgrowths of epidermal epithelium. They include: hair follicles and hair involved in heat regulation, nails protection (?, sebaceous glands and sebum lubrication, antimicrobial (?, eccrine sweat glands and sweat thermoregulation, apocrine sweat glands and sweat pheromone secretion (?) Is composed of keratinized cells: develop from hair follicles. All thin skin, with minor exceptions, has hair. Hair development is heavily influenced by hormones: facial and pubic hair production occurs during puberty male pattern baldness changes in sex hormone levels with age. There are two kinds of hair: terminal hair (thick), and vellus hair (difficult to see). colour comes from melanin. The hair follicle is responsible for the production and growth of the hair. It has a fairly uniform diameter, except at the base of the hair where it is expanded to form the hair bulb.
