The somatotopic organization of primary afferent terminals in the superficial laminae of the dorsal horn of the rat spinal cord

Transganglionic transport of wheatgerm agglutinin conjugated horseradish peroxidase (WGA‐HRP) was used to reveal the central distribution of terminals of primary afferent fibers from peripheral nerves innervating the hind leg of the rat. In separate experiments the sizes and locations of cutaneous peripheral receptive fields were determined by electrophysiological recording techniques for each of the nerves that had been labeled with WGA‐HRP. By using digital image analysis, the sizes and positions of the peripheral receptive fields were correlated with the areas of superficial dorsal horn occupied by terminals of primary afferents from each of these receptive fields.

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