Brodmann area 4 is the primary motor cortex of the brain and is located at the pre central sulcus.  It is considered the most posterior part of the frontal lobe. BA 4 controls movements of the body and sends many axons to the spinal cord, which in turn is wired to the muscles of the body.
This region is the region of the motor homunculus, which is mainly involved in controlling voluntary dynamic, kinesthetic movements.<br><p style="text-align: center;"><img src="@@PLUGINFILE@@/ba-4.png" alt="" width="487" height="747" role="presentation" class="img-responsive atto_image_button_middle" style="font-size: 1rem;"></p>