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Chapter 5 The Integumentary System (5-5 (An extensive network of…

- - - - Stratum Germinativum- the deepest epidermal layer, forms epidermal ridges (which extend to the dermis), contains melanocytes, cells whose cytoplasmic procsses extend between epithelial cells,and receptors that provide information. Epidermal cells must obtain nutrients delivered by dermal blood vessels.
        Large stem cells- germinative cells
        
        Intermediate Strata- cells are displaced from the basal layer
        Keratin- extremely durable and water resistant
        Stratum lucidum (clear layer) covers the stratum granulosum
        
        Stratum corneum- most superficial layer of epidermis, consists of 15-30 layers
        Cells are said to be keratinized
- - - - Reticular layer- consists of an interwoven meshwork of dense, irregular connectie tissue, both elastic fibers and collagen fibers are present
- - - - A portion of the stratum corneum of the fold extends over the exposed nail nearest the root,forming the cuticle
- - - - Muscles become weaker, and the bone strength decreses
        
        Sensitivity to sun exposure increases
        
        Skin becomes dry and often scaly
        
        Hair thins and changes color
        
        Sagging and wrinkling of the skin occur
        
        The ability to lose heat decreases
        
        Skin repairs proceed relatively slowly