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The Journal of Neuroscience, November 1994, 14(11): 6796-6614 Squirrel Monkey Lateral Thalamus. II. Viscerosomatic Convergent
 

Summary: The Journal of Neuroscience, November 1994, 14(11): 6796-6614
Squirrel Monkey Lateral Thalamus. II. Viscerosomatic Convergent
Representation of Urinary Bladder, Colon, and Esophagus
Johannes Briiggemann, Ting Shi, and A. Vaina Apkarian
Department of Neurosurgery, Computational Neuroscience Program, SUNY Health Science Center at Syracuse,
Syracuse, New York 13210
The response properties of 106 visceroceptive lateral tha-
lamic neurons were investigated in anesthetized squirrel
monkeys. Most neurons were located in the ventral posterior
lateral nucleus (VPL), and a smaller number of cells was also
found in a variety of thalamic nuclei around VPL. Ninety
(65%) of these cells responded to distension of the urinary
bladder, the distal colon, and/or the lower esophagus. The
majority of the visceral-responsive cells also had convergent
somatic and multivisceral responses (71% of the 65%). A
small population (6%) was visceral specific; that is, these
neurons were not activated with somatic stimuli. Visceral
responses were excitatory, inhibitory, or mixed, and most
were either visceral nociceptive specific (65%) or visceral
wide-dynamic-range type (34%). Very few visceral re-

  

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

 

Collections: Biology and Medicine