Final answer:
More than half of the entire motor cortex is allocated to controlling areas like the fingers and lower face, which perform fine, agile movements.
Step-by-step explanation:
The question asks about the primary motor cortex, which is a region in the brain responsible for the execution of voluntary movements. More than half of this area is dedicated to controlling parts of the body that require fine motor skills. This includes areas like the hands and the face, which are capable of intricate and precise movements. In the motor homunculus map, which represents a distorted human figure on the cortex, the largest regions are dedicated to body parts that perform dexterous movements. Therefore, more than half of the entire motor cortex deals with the muscles that perform fine, agile movements, especially those in the fingers and lower face.