Which of the following statements is true about the homunculus for the somatosensory cortex?
A. The homunculus was developed by experimentally recording electrical potentials from cells in the somatosensory cortex during stimulation of various parts of the body.
B. The area of the homunculus that represents the foot is adjacent to the area for the hand.
C. The proportions of the homunculus are the same as the proportions of the physical body.
D. Somatotopic organization is only found in cellular organization of the somatosensory cortex.
E. The area of the homunculus that represents the torso is adjacent to the area for the face.
ANS: A
Rationale: The homunculus represents the size of the area of primary sensory cortex devoted to specific parts of the body. This sensory map was developed by recording the electrical potentials of neurons in the sensory cortex when stimulating various areas of the body. Increased cortical representation corresponds to a higher degree of receptors and fine-motor control required by the body area. This somatotopic organization is maintained throughout the second- and third-order neurons.
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