Motor and sensory cortical homunculus

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The motor cortex is a region of the cerebral cortex in the frontal lobe involved in the control of voluntary movement. The motor cortex can be divided into two major regions: the primary motor cortex and the secondary motor areas. The primary motor cortex (Brodmann area 4) is situated in the precentral gyrus, just anterior/rostral to the central sulcus. It is somatotopically arranged such that different parts of this gyrus are associated with the motor control of the different parts of the contralateral side of the human body. A spatial map of the body in the primary motor cortex is referred to as the motor homunculus. 

The somatosensory cortex is located in the parietal lobe and is divided into two main regions: the primary somatosensory cortex and the secondary somatosensory cortex. The primary somatosensory cortex (Brodmann areas 1,2,3) is located in the postcentral gyrus, just posterior to the central sulcus. This area receives the sensory input from specific areas of the body that correlate to the specific regions of the cortex.

Similar to the motor control in the primary motor cortex, the neurons in the primary somatosensory cortex form a sensory map of the body called the sensory homunculus.

This video tutorial will provide you with an overview of motor and sensory homunculus.

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