skin notes :3

• Epidermis: outer layer, 5 sublayers, no blood vessels
• Stratum Corneum: keratinized, dead, outermost layer of the epidermis, the one exfoliated
• Stratum lucidum: thick skin on soles of foot, protection from continuous stress and pressure ( like cartilages )
• Stratum granulosum: have keratinoctyes (produce keratin)
• Stratum spinosum: (partly) for strength & flexibility
• Stratum basale: lowermost layer, "mitosis layer", contains melanocytes, forms nails & hair
• Dermis: "Skin glue", areolar connective tissue (for skin elasticity), blood vessels ( artery, vein, capillary ),

  • sensory receptors: thermoreceptors, pain receptors, mechanoreceptors
• Hypodermis ( Subcutaneous ): between dermis and muscle, has fats and adipose
• Hair: basale cells of skin, constitute of keratin and cuticle

  • 2 parts: hair root and hair shaft
• Nail: hardened keratin and cuticle that protects the hands and toes
• Glands: Secrete Substances in skin
• Sebaceous glands: produce sebum / oil that lubricated skin ( prevents dryness )
• Sweat glands: secrete sweat ( sweat has wastes, and it also helps in thermoregulation )

  
  

  • 2 types: Eccrine and Apocrine
• Ceruminous glands: EARS, secrete earwax to trap foreign substances
• Ciliary glands: EYES, secrete sweat-like substances for lubrication of eyes
• Mammary glands: secrete milk