This is detected by " peripheral " P _ _ 2 } chemoreceptors in the proprioceptors in the muscles and joints, an increase in body temperature, the release of epinephrine from the adrenal glands, and from motor impulses originating from the brain.
22.
The parts of the trigeminal nucleus receive different types of sensory information; the spinal trigeminal nucleus receives pain-temperature fibers, the principal sensory nucleus receives touch-position fibers and the mesencephalic nucleus receives proprioceptor and mechanoreceptor fibers from the jaws and teeth.
23.
Both the pulp and periodontal ligament have nociceptors ( pain receptors ), but the pulp lacks proprioceptors ( motion or position receptors ) and mechanoreceptors ( mechanical pressure receptors ) . whereas pain from the periodontal ligament will typically be well localized, although not always.
