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Axial section of the medulla at the caudal level of the olive before the central canal has opened into the fourth ventricle

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An area of infarction is evident in the left lateral medulla. The area of infarction extends from the lateral surface inwards as far as the lateral internal arcuate fibers (fibrae arcuatae internae). In the dorsoventral direction, it covers the area between the dorsal marrow of the olive and the dorsal third of the left spinal trigeminal nucleus and tract. (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.)