NR 302 Health Assessment Exam 2 Test Blueprint Chapter 12: 6 questions A & P of the layers of the skin Two Layer 1. Epidermis & Dermis Epidermis – Outer layer Completely replaces every 4 weeks  Highly differentiated  Thin but tough  Avascular & nourished by blood vessels in the dermis  Stratified into several zones o Basel cell Layer – Forms new skin cells  major ingredient: fibrous protein Keratin  Melanocytes produce pigmen...