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Diagram of pain sensation from Adolf Wallenberg's 1895 case of lateral medullary syndrome showing crossed hypoalgesia

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Sensation of pain or differentiation between the tip and head of a pin. The double-hatched areas indicate those regions where deeper pinpricks can still be felt as the head, and temperature differences of 30° to 40° C cannot be recognized. In the single but closely hatched areas, the tip and head can be perceived when pressed firmly, with temperature differences of 20° to 30° C. Finally, in the more hatched areas, the sensitivity anomalies have almost disappeared (however, there are still clear differences compared to the same areas on the other side). (Source: Wallenberg A. Anatomischer Befund in einem als “acute Bulbär-aVection [Embolie der Art. cerebellar. post. inf. sinistr?]” bescreidenen Falle. Archiv für Psychiatrie und Nervenkrankheiten 1901;34:923-59. Edited by Dr. Douglas J Lanska.)