Experiences With Intramedullary Tractotomy

Visualizing the trigeminovagal complex in the human medulla by combining ex-vivo ultra-high resolution structural MRI and polarized light imaging microscopy

“…Based on connectivity, the caudal subnucleus of the Sp5 is known to play a central role in the conduction of nociceptive input from the orofacial region 47 . These findings are also observed in clinical settings from medullary trigeminal tractotomy (Sjöquist procedure) 48 . The caudal subnucleus extends from the level of the obex to the third cervical cord level 41 and is known to have efferents to the ipsilateral- and contralateral thalamus (the mediodorsal nucleus and ventral posteromedial nucleus in particular) 49–51 , the periaqueductal grey 52,53 .…”

Visualizing the trigeminovagal complex in the human medulla by combining ex-vivo ultra-high resolution structural MRI and polarized light imaging microscopy

“…Based on connectivity, the caudal subnucleus of the Sp5 is known to play a central role in the conduction of nociceptive input from the orofacial region 47 . These findings are also observed in clinical settings from medullary trigeminal tractotomy (Sjöquist procedure) 48 . The caudal subnucleus extends from the level of the obex to the third cervical cord level 41 and is known to have efferents to the ipsilateral- and contralateral thalamus (the mediodorsal nucleus and ventral posteromedial nucleus in particular) 49–51 , the periaqueductal grey 52,53 .…”

Cortical Blindness and Spastic Quadriparesis following Apnœa in an Asthmatic Attack

“…By sectioning the descending tract at a level 4 mm. or even lower below the obex as advocated by Weinberger and Grant (1943) the complications listed above could be avoided; and by performing the operation under local analgesia as recommended by Olivecrona (1942) the resulting sensory loss could be checked and the extent of the incision regulated. Further, by pricking the medulla with a needle, the position of the tract can be established prior to the sectioning, because both the pricking and the sectioning cause momentary pain in the face.…”

Visualizing the trigeminovagal complex in the human medulla by combining ex-vivo ultra-high resolution structural MRI and polarized light imaging microscopy

“…Based on connectivity, the caudal subnucleus of the Sp5 is known to play a central role in the conduction of nociceptive input from the orofacial region 47 . These findings are also observed in clinical settings from medullary trigeminal tractotomy (Sjöquist procedure) 48 . The caudal subnucleus extends from the level of the obex to the third cervical cord level 41 and is known to have efferents to the ipsilateral- and contralateral thalamus (the mediodorsal nucleus and ventral posteromedial nucleus in particular) 49–51 , the periaqueductal grey 52,53 .…”

Cortical Blindness and Spastic Quadriparesis following Apnœa in an Asthmatic Attack

“…By sectioning the descending tract at a level 4 mm. or even lower below the obex as advocated by Weinberger and Grant (1943) the complications listed above could be avoided; and by performing the operation under local analgesia as recommended by Olivecrona (1942) the resulting sensory loss could be checked and the extent of the incision regulated. Further, by pricking the medulla with a needle, the position of the tract can be established prior to the sectioning, because both the pricking and the sectioning cause momentary pain in the face.…”

Visualizing the trigeminovagal complex in the human medulla by combining ex-vivo ultra-high resolution structural MRI and polarized light imaging microscopy

“…Based on connectivity, the caudal subnucleus of the Sp5 is known to play a central role in the conduction of nociceptive input from the orofacial region 47 . These findings are also observed in clinical settings from medullary trigeminal tractotomy (Sjöquist procedure) 48 . The caudal subnucleus extends from the level of the obex to the third cervical cord level 41 and is known to have efferents to the ipsilateral- and contralateral thalamus (the mediodorsal nucleus and ventral posteromedial nucleus in particular) 49–51 , the periaqueductal grey 52,53 .…”

Cortical Blindness and Spastic Quadriparesis following Apnœa in an Asthmatic Attack

“…By sectioning the descending tract at a level 4 mm. or even lower below the obex as advocated by Weinberger and Grant (1943) the complications listed above could be avoided; and by performing the operation under local analgesia as recommended by Olivecrona (1942) the resulting sensory loss could be checked and the extent of the incision regulated. Further, by pricking the medulla with a needle, the position of the tract can be established prior to the sectioning, because both the pricking and the sectioning cause momentary pain in the face.…”