A cortical homunculus is a visualization of the primary motor cortex and primary somatosensory cortex. The size of a body region on the model is based on the amount of cortex dedicated to that site, sometimes giving absurd-looking results.
The Sensory Homunculus Man in the Parietal Lobes of the Brain "This model shows what a man's body would look like if each part grew in proportion to the area of the cortex of the brain concerned with its sensory perception.
Redrawing the brain’s motor map Neuroscientists at Emory have refined a map showing which parts of the brain are activated during head rotation, resolving a decades-old puzzle. Their findings may help.
Almost all of behavior involves motor function, from talking to gesturing to walking. But even a simple movement like reaching out to pick up a glass of water can be a complex motor task to study. Learn how the brain can process these movements.