The Brain's Landscape: Sulci & Gyri Motor Lesion Mapping the Brain's Cortex. This MRI beautifully shows the peaks (gyri) and valleys (sulci) that define the brain's surface. These folds are crucial, increasing surface area for higher cognitive functions. The arrow points to a lesion located specifically on the precentral gyrus—the primary motor cortex. Damage here directly affects voluntary movement. . . #Neuroanatomy #collaboration #graduation #SulciAndGyri #Radiology #Neurology #competition #M