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80年代以来已在脊髓背角鉴定出10种以上新的感觉投射神经元。所有这些神经元均以其分支的轴突或侧支轴突为特征。这些神经元的分支轴突分别向两个以上的不同核团，包括体感核和内脏感觉核投射。其中有些神经元从其所投射的中枢靶核接受躯体与内脏的传入输入，同时通过分叉初级传入从外周接受躯体与内脏的传入输入。有些外周感觉输入可首先在脊神经节神经元上会聚并被加工处理。这些发现看来是对感觉神经元单投射与单支配的传统观念的挑战并参与躯体内脏相关和有关的临床障碍。
More than 10 new sensory projection neurons have been identified in the dorsal horn of the spinal cord since the 1980s. All of these neurons are characterized by their branched axons or collaterals. The branch axons of these neurons project to more than two different nuclei, respectively, including the somatosensory and visceral sensory nuclei. Some of these neurons receive the afferent input of the soma and the viscera from the central target nucleus to which they are projected, while the afferent input of the soma and the viscera is received from the periphery by the primed primary afferent. Some peripheral sensory input may first be converged and processed on the spinal ganglion neurons. These findings appear to be a challenge to the traditional concept of single-shot and single-dominated sensory neurons and are involved in somatic-related and related clinical disorders.