Localization of the motor hand area to a knob on the precentral gyrus. A new landmark

Abstract

Using functional magnetic resonance imaging (fMRI) we reliable landmark for identifying the precentral gyrus directly. We therefore conclude that neural elements involved in motor have evaluated the anatomical location of the motor hand area. The segment of the precentral gyrus that most often hand function are located in a characteristic 'precentral knob' which is a reliable landmark for identifying the contained motor hand function was a knob-like structure, that is shaped like an omega or epsilon in the axial plane precentral gyrus under normal and pathological conditions. It faces and forms the 'middle knee' of the central sulcus, is and like a hook in the sagittal plane. On the cortical surface of cadaver specimens this precentral knob corresponded located just at the cross point between the precentral sulcus and the central sulcus, and is therefore also visible on the precisely to the characteristic 'middle knee' of the central sulcus that has been described by various anatomists in the cortical surface. last century. We were then able to show that this knob is a