The second-order neurons that receive visceral inputs are mostly located in laminae I and V of the dorsal horn as well as in the ventral horn of the spinal cord. Additionally, they are also activated by somatic inputs from (a) superficial dorsal horn (neurons with visceral and superficial somatic input), brain stem, and thalamlus and (b) deep dorsal horn and ventral horn (neurons with visceral and deep somatic input).
In addition to viscerosomatic convergence there are viscerovisceral convergences in the spinal cord. An example is the convergence of inputs from the colon/rectum, bladder, vagina, and uterine cervix (as well as from the skin) or of inputs from the gallbladder and heart.
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