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Z .Brain Research 756 1997 297300 Short communication

Summary: Z .Brain Research 756 1997 297­300
Short communication
Z .Viscero-somatic neurons in the primary somatosensory cortex SI of the
squirrel monkey
Johannes Bruggemann, Ting Shi, A. Vania Apkarian )
Department of Neurosurgery, Computational Neuroscience Program, SUNY Health Science Center at Syracuse, Neurosurgery Research Laboratory, 3118
WSK Hall, 766 IrĠing AĠe., Syracuse, NY 13210, USA
Accepted 25 February 1997
Z . Z .Thirty-eight neurons in the primary somatosensory cortex SI in a-chloraloserNembutal, or halothane in N OrO anesthetized2 2
squirrel monkeys were tested for responses to distention of the urinary bladder, the distal colon and the lower esophagus. Of the 38 SI
neurons studied 13 were classified as visceroceptive. Eight of the 13 visceroceptive neurons responded to stimulation of a single viscus,
the other five responded to two viscera. All SI neurons investigated had somatic low threshold type responses. Anesthesia was a critical
factor, because 6 of 11 neurons responded to visceral stimulation only under a light halothane anesthetic level, and during moderate
halothane anesthesia levels significantly more neurons exhibited visceral inputs than under a-chloraloserNembutal. The results suggest
that the squirrel monkey SI is involved in processing of visceral information.
Keywords: Electrophysiology; Pain; Nociception; Modulation; Visceral sensation; Cortex
A surprisingly high incidence of somato-visceral and
viscero-visceral convergence was demonstrated for lateral


Source: Apkarian, A. Vania - Department of Physiology, Northwestern University


Collections: Biology and Medicine