Convergence of trigeminal input with visceral and phrenic inputs on primate C1–C2 spinothalamic tract neurons

摘要: Trigeminal, spinal and vagal afferent fibers overlap in C1-C2 segments. We hypothesized that trigeminal input from the superior sagittal sinus (SSS) can excite spinothalamic tract (STT) neurons receiving thoracic visceral or phrenic inputs. Effects of SSS stimulation were evenly divided among cells responding to each nerve stimulus; magnitude responses ipsilateral was greater excited by input. Somatic fields 80% included face areas innervated nerve, whereas somatic 89% unaffected located only on cervical nerves. Results are consistent with idea pain referred could originate organs.