Piloerection or Pilomotor Reflex
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Piloerection or pilomotor reflex, also called horripilation, consists of involuntary hair erection induced by contraction of arrectores pilorum muscles, i.e., the tiny muscles located at the origin of each body hair. It is a reaction to cold temperature or strong emotions producing the so-called cutis anserina or goose bumps/pimples. Arrectores pilorum muscles receive the contractile command by the sympathetic nervous system.