. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Figure 4. 'Direct' responses to electrical stimulation (•) applied over the magnocellular lobe in an adult Loligo (A) and a 7-day post-hatching .Viyd' (B). (A) The electrode on the pallial nerve (lower trace) records the second-order giant axon spike (2) en passant, while a second electrode on a posterior stellar nerve stump (upper trace) records the third-order spike (3) of the giant motor axon. (B) A single electrode placed over the stellate ganglion records both second- and third-order events. See text for addi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Figure 4. 'Direct' responses to electrical stimulation (•) applied over the magnocellular lobe in an adult Loligo (A) and a 7-day post-hatching .Viyd' (B). (A) The electrode on the pallial nerve (lower trace) records the second-order giant axon spike (2) en passant, while a second electrode on a posterior stellar nerve stump (upper trace) records the third-order spike (3) of the giant motor axon. (B) A single electrode placed over the stellate ganglion records both second- and third-order events. See text for additional details. system acting alone can generate intense episodes of motor activity (second cycle in Fig. 5C). In all these respects our findings agree with Otis and Gilly (1990). Recordings of motor outputs in hatchling and embryonic Loligo Recordings from the stellate ganglion of late-stage em- bryos and hatchlings after electrical stimulation of the head show activity associated with both giant and non-. —^ 400 uV 1000 uV 5 ms i , 3 400 uV 600 uV A Figure 5. Bursts of motor activity associated with escape jetting in adult Loligo. In each panel (A-D) the upper trace is from the pallial nerve, and the lower trace is from a stellar nerve. (A) A light flash stimulus (*) results in firing of the giant axons (2 and 3) after a delay of ~50 ms and before the onset of the non-giant motor burst. (B) Portions ot the records in (A) are displayed on an expanded time scale to illustrate the time course of the giant axon spikes. (C) An electrical stimulus (•) leads to giant axon activation after a long delay (>500 ms). In this case, the burst of small axon motor activity commences before the giant spike. A second escape cycle at the end of the record is driven by non-giant axons acting alone and shows no giant spike. (D) The first cycle in (C) is dis- played at an expanded time Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
