Describe the homunculus of the primary motor cortex. How is the size of a given structure on the homunculus (for example, the lips as opposed to the toes) related to function? Compare this to the somatosensory homunculus
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The motor cortex can be mapped to show where, and in what proportions, different parts of the body are represented in the brain. Maps of this kind are called homunculi (homunculus is Latin for "little person") because they depict the body parts of a person mapped on the brain. For both motor and sensory function, the size of the body part in the homunculus is related to function. Those areas of the body that are particularly sensitive or that are used in fine, complex motions have larger representations in the brain.
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