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Changes in the dorsal lateral geniculate nucleus of the squirrel monkey after unilateral ablation of the visual cortex

Young adult squirrel monkeys were subjected to unilateral occipital lobectomies, and were allowed to survive for 3 to 42 days. Both light and electron microscopic techniques were employed to examine orthograde as well as retrograde changes in the ipsilateral dorsal lateral geniculate nucleus. Three stages of degenerative change were described. During the early stage (third to fourth post‐operative day) there were early signs of corticogeniculate terminal degeneration. During the intermediate stage (fifth to eighth day) most of the RS (small axonal terminals with round vesicles) or corticofugal endings were seen to undergo a sequence of degenerative change: swelling or irregularity of the synaptic vesicles; electron dense disintegration; and finally the engulfment by glial elements. The small myelinated axons also become electron dense at this stage, and there were early signs of retrograde degeneration. The late stage was characterized by severe changes and final disappearance of the geniculocortical relay neurons as well as their axons and dendrites. Concurrently, most of the RS terminals were also removed from the LGN, and there was considerable re‐organization of the rest of the synaptic population.