Anatomy and Cell Biology 3309 Lecture Notes - Lecture 1: Eccrine Sweat Gland, Stratified Squamous Epithelium, Stratum Corneum
19 Aug 2019
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Acb 3309 lecture 1 (23) integumentary skin. Protection: barrier against physical, chemical, and biological agents in external environment. Prevention of water loss: acylglucosylcermide in the stratum corneum is a water proofer. Pns receptors to know what we"re touching/sensing: vitamin d production, heat regulation, heating us up: constricting blood flood to skin allows more blood to go to other organs, cooling us down: sweat evaporates and takes away heat. Secretion of waste through eccrine sweat glands, apocrine sweat glands, and sebaceous glands: epidermis, keratinizing stratified squamous epithelium, dermis, mostly dict (reticular layer); Some lct (papillary layer) near epidermis: subdermis/hypodermis. Thick skin = thicker epidermis & w/out hair: thin dermis, has sweat glands though. Thin skin = thinner epidermis & w hair: thick dermis, has sweat glands too, has sebaceous glands. Thickest skin on body is technically thin skin that is on your back for protection from attack from behind. Layers of the epidermis: renewed every 2-4 weeks.
