Integumentary System Chapter#3

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  • 1.
    • Chapter # 3
    • Integumentary System
    • By: Precious Blanton
  • 2.
    • Introduction
    • The integumentary system is the external covering of the body, including skin, hair, nails and sweat glands. The integumentary system is responsible for excreting wastes and regulating temperature, and is the location of sensory receptors for pain, pressure and temperature. During this presentation I will list and describe the three layer of skin and their function. I hope you enjoy and I hope you will find helpful, informative on the integumentary system.
  • 3.
    • Tissues of the skin (there are three layer) .
    • Dermis- largely connective tissue; many
    • nerves and blood vessels; smooth muscle. Also, it is 1-2mm thick,3mm thick on the soles and palms.
    • Did you know the male skin is thicker than females ?
    • Subcutaneous layer- is the innermost layer, containing fatty tissue.
    • epidermis- straitified squamous epithelium
    • basement membrane.
  • 4.  
  • 5.
    • In those parts of the skin which we perceive as "hairy" we find terminal hairs . The free part of each hair is called the shaft .
    • The root of each hair is anchored in a tubular invagination of the epidermis, the hair follicle , which extends down into the dermis and, usually, a short distance into the hypodermis.
    • The hair that you groom daily is actually dead keratinized cells.
    • Each hair follicle has an associated bundle of smooth muscle, the arrector pili muscle . This muscle inserts with one end to the papillary layer of the dermis and with the other end to the dermal sheath of the hair follicle. This makes your hair stand up on its end.
  • 6. Copyright 2003 by Mosby, Inc. All rights reserved.
  • 7.
    • Nails
      • Plates of stratified squamous epithelial cells with hard keratin
      • Protect distal ends of phalanges
      • Cells are keratinized in the nail root
      • Nail growth occurs in the lunula
      • Cuticle is a fold of stratum corneum on the proximal end of nail
  • 8.  
  • 9. Two types of exocrine glands Sebaceous- sebum (oil, wax) associated with hair follicles helps maintain pliability of skin Sweat glands apocrine (armpits, groin) merocrine (eccrine)- widely distributed important for maintaining body temperature
  • 10.  
  • 11. Aging and the integumentary system Declines in: Cell division in stratum basale Melanocyte production Glandular activity Hair follicle function Elastic fiber function in dermis Blood supply to skin Rate of repair
  • 12. Problems of skin Lesions infections (bacterial, viral, fungal,parasitic) inflammatory reactions allergens Hyperkeratinization Tumors basal cell (stratum basale) squamous cell melanoma
  • 13. Trauma abrasions, incisions, lacerations Repair inflammation scab formation fibroblast activity (scar formation) Burns- severity depends on depth of damage Rashes- so many causes!
  • 14.
    • Conclusion
    • The integumentary system is the organ system that protects the body from damage, comprising the skin and its appendages(including hair , scales , and nails ). I believe the integumentary system has a variety of functions; it may serve to waterproof, cushion and protect the deeper tissues, excrete wastes, regulate temperature and is the attachment site for sensory receptors to detect pain, sensation, pressure and temperature.Also, In humans the integumentary system additionally provides vitamin D synthesis.