The primary motor cortex in the posterior frontal lobe (Brodmann area 4) was first described by David Ferrier in 1874, who used electrical stimulation to map the cortical areas responsible for movement in monkeys 1).Since these initial findings, the description of this area has evolved to include the concept of a somatotopic map, wherein different parts of the body are represented individually on the primary motor cortex, as observed by Penfield and Boldrey 2)