. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 260 A REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS VNLR. B VNLL VNLR VNLR Further investigations into the identity of the premotor inter- neurons and the role of descending input from the brain and the thoracic ganglia must be made if we are to have a detailed description of the circuitry that produces the pupal motor pat- tern. Such a description can provide a framework upon which to investigate the developmental processes that sculpt out cir- cuits for rhythmic motor patterning. This system is an ideal model for examin
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 260 A REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS VNLR. B VNLL VNLR VNLR Further investigations into the identity of the premotor inter- neurons and the role of descending input from the brain and the thoracic ganglia must be made if we are to have a detailed description of the circuitry that produces the pupal motor pat- tern. Such a description can provide a framework upon which to investigate the developmental processes that sculpt out cir- cuits for rhythmic motor patterning. This system is an ideal model for examining these processes, since the dramatic func- tional respecification of the proleg neuromuscular system occurs over a period of a few days. Thus we may further understand the mechanisms by which the nervous system may accommodate adaptational changes that are dictated by the developmentally regulated behavioral demands of the organism. I wish to thank Dr. J. C. Weeks for supplying larval Muntlnca and necessary equipment, as well as providing comments on a previous version of the manuscript. I also thank Dr. D. J. Sands- trotn for useful discussions on the project. Financial support was provided by the Grass Foundation. Literature Cited I Levine, R. B., and J. C. Weeks. 1989. Pp. 195-228 in Perspec- tives in Neural Systems and Behavior, T. J. Carew and D. Kelly, eds. Alan R. Liss, New York. 2. Miles, C. I., and J. C. Weeks. 1991. J. Comp. Pliysiol. [A] 168: 174-190. 3. Mesce, K. A., and J. W. Truman. 1988. J. Comp. Pliysiol. [A] 163: 287-299. 4. Sandstrom. D. J. 1993. dissertation. University of Califor- nia. Berkeley. 5. Sandstrom, D. and J. C. Weeks. 1991. SOL: Neurosci. Abstr. 17: 1227. 6. Lubischer, J. L., L. D. Verhegge, and J. C. Weeks. 1995. Si>c. Neurosci. Abstr. 21: 426. 7. Weeks, J. and G. A. Jacobs 1987. J. Comp. Pliysiol. [A] 160: 315-329. D VNLR iiu li M mV Figure 1. Intraccllular recordings (top trace) from neurons active with the pupal motor patte
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