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AJNR - American Journal of Neuroradiology

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Pli de Passage Fronto-Pariétal Moyen of Broca Separates the Motor Homunculus

H. Alkadhi^a and Spyros S. Kollias^a

^a From the Institute of Neuroradiology, University Hospital Zurich, Zurich, Switzerland

View larger version (105K): [in a new window]   FIG 1. The first description and illustration of the complete form of a pli de passage fronto-pariétal moyen was provided by Wagner in 1862 (3) (right hemisphere, left image). A superior view on the 3D surface reconstruction of the SPGR in our subject is shown on the right. Note the connecting gyrus (arrow) between the pre- and postcentral gyrus at the level of the middle genu of the central sulcus, as opposed to the common configuration of the central region in the opposite hemisphere (asterisk [*]). MR image is skipped for better comparison.

View larger version (81K): [in a new window]   FIG 2. M1 activation patterns in a control subject harboring the common configuration of the central region (upper row) and in the subject harboring the pli de passage fronto-pariétal moyen (first functional MR imaging session: middle; second session: lower row). Activation was present for each movement tested along the lateral and/or medial border of the accessory gyrus (arrows). The M1 wrist representation was consistently split into two parts, one being laterally, the other medially located. The M1 finger and elbow representations were completely separated from each other.