Denervated Pacinian corpuscles from the slow loris (Nycticebus coucang) obtained on the 49th and 75th post-operative days were subjected to electron microscopic investigation. Unremoved myelin debris occurred within the endoneurial tube during the early stages of regeneration and there was extensive fibrosis in the later stages. These factors may prevent the reinnervating nerve fibre from entering the corpuscle. The changes in the blood vessels may be due to disuse atrophy.