Paraphoral nerve

The paraphoral nerve is a feature of Sebaceans, its function is to route poisons from the system. Once it is damaged it doesn't regenerate or heal, and depending on how wounded the nerve is, it may fail after only a few days. The only treatment is a tissue graft from a genetically compatible donor. Aeryn Sun had her Paraphoral nerve damaged by Larraq. ("A Bug's Life", "Nerve")