Which of the following statements about cortical homunculus accurately describes the representation of body parts?*1 pointA) The size of each body part is directly proportional to its physical size in the human body.B) The representation of body parts is uniform, with each body part allocated an equal amount of cortical space.C) Body parts requiring finer motor control or with higher sensory acuity are represented with larger cortical areas.D) The representation of body parts is randomly distributed across the cortex, unrelated to their functional significance.
Question
Which of the following statements about cortical homunculus accurately describes the representation of body parts?*1 pointA) The size of each body part is directly proportional to its physical size in the human body.B) The representation of body parts is uniform, with each body part allocated an equal amount of cortical space.C) Body parts requiring finer motor control or with higher sensory acuity are represented with larger cortical areas.D) The representation of body parts is randomly distributed across the cortex, unrelated to their functional significance.
Solution
The correct answer is C) Body parts requiring finer motor control or with higher sensory acuity are represented with larger cortical areas.
This is because the cortical homunculus is a visual representation of the concept of "sensory and motor homunculi", which illustrates the space that individual body parts occupy in the somatosensory cortex and the motor cortex. The size of each body part in the homunculus is not proportional to the physical size of the body part, but rather to the amount of sensory or motor neurons it contains. Therefore, body parts that require finer motor control or have higher sensory acuity, such as the hands and the lips, are represented with larger cortical areas.
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