The postsynaptic dorsal column pathway arises from cells distributed medial to laterally in lamina III in the dorsal horn, as well as from a few cells just lateral to lamina X (63,91,97-99). The trajectories of postsynaptic dorsal column fibers are somatotopically organized in the dorsal column (74,100,101).
Although the postsynaptic dorsal column pathway in rats may not have a role in cutaneous pain (13,15,102), the postsynaptic dorsal column cells in rats and monkeys were shown to respond to both mechanical and chemical irritation of viscera (13,15). They receive inputs from the colon, the ureter, the pancreas and epigastric structures (96). Presumably, the visceral information is relayed together with cutaneous epicritic information in the medial lemniscus to the thalamus (103).
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