. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 C. K. GOVIND a close similarity in their firing patterns during slow closing. Maintaining the closed claw was achieved by the FCE and SCE axons in the crusher but only by the SCE in the cutter claw though all three axons were similar in their firing patterns. Thus the FCE alone showed an asymmetry in firing patterns between cutter and crusher claws in intact juvenile lobsters. In contrast to the above, the in vitro activity of the adult motoneurons shows a clear asymmetry between FCE and SCE in both claws and between bot
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 C. K. GOVIND a close similarity in their firing patterns during slow closing. Maintaining the closed claw was achieved by the FCE and SCE axons in the crusher but only by the SCE in the cutter claw though all three axons were similar in their firing patterns. Thus the FCE alone showed an asymmetry in firing patterns between cutter and crusher claws in intact juvenile lobsters. In contrast to the above, the in vitro activity of the adult motoneurons shows a clear asymmetry between FCE and SCE in both claws and between both homologs (Govind and Lang, 1981). Activity of the motoneurons was recorded from their respective somata in response to electrical stimulation of the mixed nerve roots in an isolated claw-ganglion preparation. In both claws, the FCE fired at a lower frequency and for a shorter time than the SCE. When homologous somata were examined, the crusher FCE and SCE produced higher frequencies and longer bursts of spikes than their cutter counterparts (Fig. 12). Since this asymmetry was found in response to both sensory stimulation via the 2nd nerve root and depolarization of the soma it could have both an extrinsic (sensory) and intrinsic (built-in) origin. The motoneurons also produce a distinct pattern of paired impulses (Costello et al, 1981; Govind and Hill, 1982) which are functionally more effective in generating muscle tension than uniformly spaced impulses of the same average frequency (Ripley and Wiersma, 1953; Govind and Lang, 1974). In intact juvenile lobsters, paired impulses with interpulse intervals of between 8 to 13 ms, were found for both FCE and SCE axons in both claws. The only indication of asymmetry in this firing pattern FCE B SCE. Cutter soma Crusher soma J D. 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 o
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