Answer:
The size of the somatosensory or motor cortex map of a particular part of the body appears to be related to the degree of sensitivity or motor control required for that body part. For example, the areas of the cortex responsible for the fingers and mouth tend to be relatively large because these areas require a high degree of fine motor control and sensitivity. Conversely, areas of the body that require less motor control and sensitivity, such as the back or arms, tend to have smaller cortical maps. Additionally, the cortical maps can change in response to changes in sensory or motor input, such as amputation or injury. This phenomenon is known as cortical plasticity, and it allows the cortex to adapt to changes in the body and the environment.