Wednesday, September 5, 2012

SKIN & APPENDAGES


SKIN AND APPENDAGES

 

1. ANATOMY

The skin is the outer envelop of the body and has a large surface

area (1-1.8 sq. meters).

   *  The thickness varies, being thin on the the eyelids, glans

      penis and thick on the soles of the feet, palms of the

      hands and back

   *  There are two components of skin the outer (superficial)

      epidermis with the function of producing keratin.

      The cells show characteristics of differentiation

      proceeding on to degeneration with the keratin placed most

      superficially.

   *  The deeper layer,the dermis consists of collagen, elastic

      fibres and fat cells(

   *  This deep layer supports the nerves, blood vessels and the

      skin appendages (hair follicles, sweat glands).

   *  The skin also contains melanocytes that prduce melanin.

   *  This material provides colour to the skin and protects the

      germinal layers and the melanocyte from the effects of

      ultraviolet light.
 
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