Coical representation of body in the cerebrum is

The various pas of the body are represented in the precentral gyrus, 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 propoionate 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 apposable thumbs to manipulate the environment are activities in which humans are especially skilled.Ref: Ganong's Review of Medical Physiology, Twenty-Third Edition