This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Wallarian degeneration is seen in 
Select and explain. 
A. Distal to injury, B. Proximal to injury, C. At both ends, D. In cell body (soma)
A: Distal to injury
Answer: A: Distal to injury 
Explanation: The destructive and constructive changes which occur in a nerve fibre after injury are called degeneration and regeneration respectively. The degenerative changes in distal pa of cut nerve fibre are Wallerian degeneration. Ref: guyton and hall textbook of medical physiology 12 edition page number: 74,75,76