sentences:  Mesencephalic nucleus of trigeminal nerve
  
  The mesencephalic nucleus of trigeminal nerve is involved with reflex proprioception of the periodontium  and of the muscles of mastication in the jaw that functions to prevent biting down hard enough to lose a tooth.To subserve this reflex protective function, mechanoreceptive nerves in the periodontal ligament sense tooth movement and project to the mesencephalic nucleus.