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The hope entertained in Sjöqvist's interesting treatise is that in the treatment of trigeminal neuralgia a differential section of a bundle of pain fibers in the medulla can abolish pain and preserve other sensations to the face, particularly the sense of touch. He has operated on nine patients by means of this intriguing procedure with interesting results and without deaths. That sensations carried by the trigeminal nerve become segregated in the sensory root has been demonstrated by partial sections of the sensory root at the pons. That they then are carried by different tracts in the brainstem would appear to be assured. Spiller long ago advanced such a view. Sjöqvist attempts to utilize this fact by cutting only the pain fibers in the medulla. At least, he appears to have identified this tract with sufficient accuracy to be able to spare the tactile sensation to the face after division of
Studies on Pain Conduction in the Trigeminal Nerve: A Contribution to the Surgical Treatment of Facial Pain. By Olof Sjöqvist. JAMA. 1940;115(5):408. doi:10.1001/jama.1940.02810310066025