This document discusses the anatomy and structure of nerves, types of nerve injury and factors that affect nerve regeneration and surgical repair. It notes that nerve regeneration requires Schwann cells and proper apposition of nerve endings without tension, debris or excessive swelling. Factors like age, injury nature/size, time since injury, nerve type/size and medications impact prognosis. Nerve grafting can help avoid tension but risks donor site issues and poor function. Nerve conduits may guide regeneration but can impact oxygen/nutrient supply or cause inflammation/fibrosis depending on the material. The results of nerve grafting range from satisfactory to poor.