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J Neurophysiol 85: 174-186, 2001;
0022-3077/01 $5.00
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The Journal of Neurophysiology Vol. 85 No. 1 January 2001, pp. 174-186
Copyright ©2001 by the American Physiological Society

Cerebral-Abdominal Interganglionic Coordinating Neurons in Aplysia

Yuanpei Xin,3 John Koester,1 Jian Jing,2 Klaudiusz R. Weiss,2 and Irving Kupfermann1

 1Center for Neurobiology and Behavior, College of Physicians and Surgeons, Columbia University, New York 10032;  2Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029; and  3Department of Genetics and Biochemistry Research Lab, University of Utah, Salt Lake City, Utah 84108

Xin, Yuanpei, John Koester, Jian Jing, Klaudiusz R. Weiss, and Irving Kupfermann. Cerebral-Abdominal Interganglionic Coordinating Neurons in Aplysia. J. Neurophysiol. 85: 174-186, 2001. Three cerebral-abdominal interneurons (CAIs), CC2, CC3, and CC7, were identified in the cerebral ganglion C cluster. The cells send their axons to the abdominal ganglion via the pleural-abdominal connective. CC2 and CC3 are bilaterally symmetrical cells, whereas CC7 is a unilateral cell. CC3 is immunopositive for serotonin and may be the same cell (CB-1) previously described as located in the B cluster rather than the C cluster. We suggest that the full designation of CC3, be CC3(CB-1). All three cells respond to feeding-related inputs. Each CAI has a monosynaptic connection to at least one abdominal ganglion neuron involved in the control of various nonsomatic organs. The CAIs also exert widespread polysynaptic actions in the abdominal and head ganglia. The results suggest that the CAIs may act as interneurons that coordinate visceral responses mediated by the abdominal ganglion, with behaviors such as feeding and head withdrawal, that are controlled by neurons located in the head ganglia of the animal.




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