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Somatotopy and Organization of Spinothalamic Tracts in the Human Cervical Spinal Cord
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Somatotopy and Organization of Spinothalamic Tracts in the Human Cervical Spinal Cord
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Journal Article
Somatotopy and Organization of Spinothalamic Tracts in the Human Cervical Spinal Cord
2019
Overview
Abstract
BACKGROUND
Understanding spinothalamic tract anatomy may improve lesioning and outcomes in patients undergoing percutaneous cordotomy.
OBJECTIVE
To investigate somatotopy and anatomical organization of spinothalamic tracts in the human cervical spinal cord.
METHODS
Patients with intractable cancer pain undergoing cordotomy underwent preoperative and postoperative quantitative sensory testing for sharp pain and heat pain on day 1 and 7 after cordotomy. Intraoperative sensory stimulation was performed with computed tomography (CT) imaging to confirm the location of the radiofrequency electrode during cordotomy. Postoperative magnetic resonance (MR) imaging was performed to define the location of the lesion.
RESULTS
Twelve patients were studied, and intraoperative sensory stimulation combined with CT imaging revealed a somatotopy where fibers from the legs were posterolateral to fibers from the hand. Sharpness detection thresholds were significantly elevated in the area of maximum pain on postoperative day 1 (P = .01). Heat pain thresholds for all areas were not elevated significantly on postoperative day 1, or postoperative day 7. MR imaging confirmed that the cordotomy lesion was in the anterolateral quadrant, and in this location the lesion had a sustained effect on sharp pain but a transient impact on heat pain.
CONCLUSION
In the high cervical spinal cord, spinothalamic fibers mediating sharp pain for the arms are located ventromedial to fibers for the legs, and these fibers are spatially distinct from fibers that mediate heat pain.
Publisher
Oxford University Press,Copyright by the Congress of Neurological Surgeons,Wolters Kluwer Health, Inc
