. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 10. "Mechanisms" of burst activity. A. Multiple chain. Top cell, pacemaker; second row, interneurons; bottom row, motor neurons. B. Closed chain. No morphological pacemaker, every unit acting as pacemaker, motor neuron, and interneurbn. Equivalent connec- tions between all units. C. Modified closed chain. Non-equivalent connections between units. "Pacemakers" (top cell) in limited sense, but reciprocal interaction and flexibility remain domi- nant. Probably analogous to organization of cardiac
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 10. "Mechanisms" of burst activity. A. Multiple chain. Top cell, pacemaker; second row, interneurons; bottom row, motor neurons. B. Closed chain. No morphological pacemaker, every unit acting as pacemaker, motor neuron, and interneurbn. Equivalent connec- tions between all units. C. Modified closed chain. Non-equivalent connections between units. "Pacemakers" (top cell) in limited sense, but reciprocal interaction and flexibility remain domi- nant. Probably analogous to organization of cardiac ganglion; see discussion. D. Functional relations within decapod heart; see discussion. LC, large ganglion neurons; SC, small ganglion neurons; M, cardiac muscle; arrows = —stimulates - -"; dashes indicate uncertainty. The two parameters, impulse activity during the burst (frequency and duration) and burst frequency are not independent (Fig. 2). The silent period, which cor- responds with a period of lowered electrical excitability (Rijlant, 1932c; Maynard, 1953b) and follows a period of excitation, probably represents a post-excitatory de- pression. For a single unit its duration is proportional to the difference between the level of spontaneous activity and the average frequency obtained by the unit during the burst. Thus, the mean frequency of the unit is not appreciably changed by a shift from a spontaneous run to intermittent trains (Fig. 6).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
