Nerve fibres of the parasympathetic nervous system arise from the central nervous system. Specific nerves include several cranial nerves, specifically the oculomotor nerve, facial nerve, glossopharyngeal nerve, and vagus nerve. Three spinal nerves in the sacrum (S2-4) also act as parasympathetic nerves.
The word longevity is sometimes used as a synonym for life expectancy in demography - however, the term longevity is sometimes meant to refer only to especially long-lived members of a population, whereas life expectancy is always defined statistically as the average number of years remaining at a given age.
A lien bond is a legal document that names a person's property as collateral against a loan. It is used to ensure that debts are paid. If the debt is not paid on time, the property may be seized as payment. Specific legal situations determine the type of lien bond that will be used. In the United States, the term lien bond has a broader definition than that used in other countries.