Humunculus

Pacinian Corpuscle

Plasticity in Cortical Real Estate

This is the "humunculus" a figure with proportions that resemble those of the representation of body areas on the somatosensory cortex. Areas of high acuity and sensitivity like lips and fingers occupy relatively large areas of somatosensory cortex, while areas of low sensitivity and acuity like back and leg occupy relatively small areas of cortex.

Best not to try this at home. It is better left in the hands of professionals