Anatomy and Cell Biology 3309 Lecture Notes - Lecture 2: Eccrine Sweat Gland, Vellus Hair, Arrector Pili Muscle
12 Jan 2017
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Document Summary
Skin appendages are derived from downgrowths of epidermal epithelium. Hard keratin similar to skin (soft keratin) Difference how keratin is cross-linked and involvement of different ions. Hair follicles & hair: involved in thermoregulation. Nails: i. e. for someone who has anorexia, their hairs are thicker bc of loss of fat: protective function. Eccrine sweat glands: lubrication, antimicrobial functions, thermoregulation involved in exercise, found throughout your body (except lips & certain regions of external genitalia) Apocrine sweat glands and (cid:498)sweat(cid:499: responsive to emotional stress, pheromone secretion, (cid:498)stinky gland(cid:499, concentrated in axillary and groin region. Hair is composed of keratinized cells: develop from hair follicles. Thick skin (palms/sole of feet) has no hair. Hair development is heavily influenced by hormones: facial & pubic hair production occurs during puberty, male pattern baldness changes in sex hormone levels with age (fine vellus hairs) Two kinds of hair: terminal hair (thick, vellus hair (fine)
