Area 4 of the coex corresponds to:: (A) Primary motor area, (B) Primary sensory area, (C) Visual coex, (D) None of the above
Answer is A. The primary motor coex (MI) corresponds to the precentral gyrus (area 4). It is the area of coex with the lowest threshold for eliciting contralateral muscle contraction by electrical stimulation. Ref: Gray's anatomy 40th edition, Chapter 21.