The Integumentary System

The Integumentary System

1. Skin structure

   • The Epidermis
     • keratinized, stratified squamous epithelium
       • 4 (5) layers 1. stratum corneum 2. stratum Lucidum (only in palms and soles) 3.stratum Granulousum 4.stratum spinosum 5.stratum basale
     • not vascularised. recieves nourishment by diffusion
   • The Dermis
     • thick region of skin
     • vascularised
     • 2 main regions 1. papillary region. - protrusions into epidermis 2. reticular region
     • joined to epidermis by DERMO-EPIDERMAL JUNCTION
   • additional structures
     • hair
     • nails
   • Glands
     • ECCRINE - sweat glands. temperature regulation.
     • APOCRINE - scent glands. in axillae and genitals
     • SEBACEOUS - produce secretions to lubricate structures. i.e. skin or hair.

2. Overall skin functions