This chapter will take as its primary mission the description of laminae I–VI (Fig. 4.1). The relations of these laminae to earlier organizational schemes of the dorsal horn were presented by Rexed (1952, 1954). The earlier edition of this book was concerned primarily with describing classic work, particularly studies using the Golgi method, and correlating this material with advances made by electron-microscopic examination of the dorsal horn. Since that time there has been an explosion of structural studies, many using completely new techniques, that are providing further insight into the organization of the dorsal horn. To keep the size of this chapter in reasonable bounds, we will focus on the primary afferent input (and not consider the equally important descending input) and restrict the cited studies essentially to those concerned with mammals.
KeywordsDorsal Horn Superficial Dorsal Horn Central Terminal Substantia Gelatinosa Primary Afferent Fiber
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