-Sciatic nerve (PNS) is cut
  and axons degenerate:
  Schwann cells repopulate
   nerve
-Nerve length sutured to cut
   optic nerve
-Retinal axons regrow in grafted
   nerve
-Retinal axons reestablish synapses
   (radioactive label transported)
                           (work of Aguayo et al.)
Chapter 55-20
Kandel et al.