Coical representation of body in the cerebrum is:

The primary motor coex (precentral gyrus in the frontal lobe) was mapped to show the various pas of the body and are represented (motor homunculus) with the feet at the top of the gyrus and the face at the bottom. The facial area is represented bilaterally, but the rest of the representation is generally unilateral, with the coical motor area controlling the musculature on the opposite side of the body. The coical representation of each body pa is propoional in size to the skill with which the pa is used in fine, voluntary movement. The areas involved in speech and hand movements are especially large in the coex; use of the pharynx, lips, and tongue to form words and of the fingers and opposable thumbs to manipulate the environment are activities in which humans are especially skilled. The cells in the coical motor areas are arranged in a columnar organization. So it shows a veical representation. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 12. Reflex and Voluntary Control of Posture & Movement. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e