<prompt> True about Wallerian degenerationIt is proximal degenerationMyelin sheath degeneration is the first change to occurIts a type of nerve regenerationNone  <response>: Distal Wallerian degeneration: mediated by calcium influx and activation of axonal proteases 24 hours:neurofilaments break up and the axon fragments into sho lengths. Within 10 days:myelin decomposes into fat droplets after 10 days, Schwann cells begins to fragment myelin sheath...a change from myelinating to demyelinating In 3 months: macrophages phagocytose the debris, leaving behind only endoneural tube ghost tube filled by the rapidly multiplying Schwann cells cytoplasm 