Adrenergic FibersSympathetic Fibers, PostganglionicAutonomic Fibers, PostganglionicSympathetic Nervous SystemHorner SyndromeNerve TissueNerve FibersTyrosine 3-MonooxygenaseCatsElectric StimulationNorepinephrineDietary FiberMuscle Fibers, SkeletalMineral FibersMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchCotton FiberStress FibersPurkinje FibersNerve Fibers, MyelinatedMossy Fibers, HippocampalMusclesMuscle ContractionMuscle, Skeletal