Integumentary

• stratum corneum


  most superficial layer of the epidermis, comprised of 15-30 layers of keratinized cells
• stratum basale


  most deep layer of epidermis; stem cells and mitosis
• keratin


  water insoluble protein that protects from epithelial stressors
• melanin


  pigment; UV protection
• Langerhan cells


  macrophages in the epidermis
• Merkel cells


  tactile; touch cells
• skin function


  protection, temperature, sensation, excretion & absorption, vitamin D synthesis
• axillae


  armpit
• apocrine


  sweat glands influenced by hormones, thick (lipid) secretion
• eccrine


  sweat glands; electrolytic secretion, thermoregulation, antibacterial
• sudoriferous


  sweat
• sebaceous glands


  oil glands, secrete into hair follicles, inactive until puberty
• parts of the nail


  free edge, body, lunula, cuticle, nail root, nail matrix
• nail function


  protect & support fingertip & toes
• parts of hair


  shaft, root, follicle, root plexus, arrector pili
• hair function


  protection & sensation
• accessory structures


  hair, nails, sweat glands, sebaceous glands
• epidermis


  superficial layer of stratified squamous epithelium
• dermis


  blood vessels, elastic fibers, collagen fibers, hair follicles, sweat & oil glands
• keratinocytes


  produce keratin
• melanocytes


  produce skin pigment
• hypodermis


  subcutaneous; skin stability through reticular attachment, cushioning, insulation, energy stores