Synapses between neurones in the central nervous system of the leech.
D000818:Animals; D002490:Central Nervous System / Q000033:anatomy & histology / Q000502:physiology*; D007865:Leeches; D009416:Nerve Regeneration; D009474:Neurons / Q000502:physiology*; D013569:Synapses / Q000502:physiology*