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.
This means that the electrons making up the bonds in each single molecule of benzene are actually constantly in motion, producing the resonance hybrid structure which is the composite, or average, structure so that each carbon-carbon bond is identical and halfway between the length of a single and a double bound.his means that the electrons making up the bonds in each single molecule of benzene are actually constantly in motion, producing the resonance hybrid structure which is the composite, or average, structure so that each carbon-carbon bond is identical and halfway between the length of a single and a double bound.