Cells of the mesencephalic n. are the only primary sensory neurons within the brain (rather than in a ganglia external to the CNS). The pseudounipolar neurons in this nucleus convey proprioceptive and pressure information from the teeth, periodontium, hard palate and joint capsules, mostly via the Vth cranial nerve. Central destinations of the fibers are the Motor & Main (sensory) nuclei of V. One special function is sending proprioceptive information from the jaw to the motor nucleus of V to mediate the monosynaptic jaw reflex.
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