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TNC (spinal trigeminal nucleus caudalis (Sp5C; TNC): There is also a central afferent projection from the trigem- inal ganglion that enters the caudal medulla of the brain stem, via the trigeminal tract, which terminates in the spinal trigeminal nucleus caudalis (Sp5C; TNC), as well as the upper cervical spinal cord (C1–C2).  physiology.org Pustelga) | |||