. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTEGRATION IN A SIMl' (iAXGLION 423. B ... .. hJ, ... FIGURE 2. A. Normal burst: simultaneous records from the ganglion trunk (C. G.) and the dorsal nerve (). The two impulses in the dorsal nerve originated in the ventral, thoracic ganglia. Diagram indicates position of recording electrodes on ganglion trunk. B. Alternating burst. C. Double burst following a normal burst. All records from semi-isolated Homarus preparations. Time scale, second. Occasionally an alternating rhythm (Fig. 2b) or double bursts (Fig. 2c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTEGRATION IN A SIMl' (iAXGLION 423. B ... .. hJ, ... FIGURE 2. A. Normal burst: simultaneous records from the ganglion trunk (C. G.) and the dorsal nerve (). The two impulses in the dorsal nerve originated in the ventral, thoracic ganglia. Diagram indicates position of recording electrodes on ganglion trunk. B. Alternating burst. C. Double burst following a normal burst. All records from semi-isolated Homarus preparations. Time scale, second. Occasionally an alternating rhythm (Fig. 2b) or double bursts (Fig. 2c ) oc- curred (see Rijlant, 1936). In the alternating rhythm the longer discharge was followed by a slightly longer silent period. The spike pattern was consistent within either short or long bursts, but differed between the two. In the double burst the terminal small spike activity continued two or three times longer than usual until large spikes again appeared. The pattern of this second half of the burst was not like that of the first, and there were fewer large spikes. TABLE I Gross parameters of burst activity (Homarus, ten animals) Parameter Mean value Range Heart (burst) rate per second to Burst duration second to Spikes per burst 54 19 to 96 Interbnrst duration Burst duration (ratio) to Gross parameters of burst activity were measured in ten Homarus immediately after preparation (Table I) ; these were semi-isolated ganglia. The heart (burst) rate is somewhat lower than that measured in i'iro by Burger and Smythe (1953). which ranged between and beats per second. Muscle potentials The slow potential changes recorded in semi-isolated ganglia (Figs. 2 and 4) are probably muscle action potentials. They are comparable in shape and duration to potentials recorded from the cardiac muscle by gross electrodes and by intra- cellular glass capillaries and are absent in isolated ganglia. Slow potentials oc- curring before and duri
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