期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 214, 期 10, 页码 1676-1684出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.051953
关键词
locomotion; retractor unguis; posture control; adhesion; attachment structures; electromyogram (EMG); phasmatodea; Carausius morosus; Cuniculina impigra
类别
资金
- Federal Ministry of Education and Research, Germany [01RB0802A]
The activity of the middle part of the claw retractor muscle was examined in two species of stick insects (Carausius morosus and Cuniculina impigra). We performed electromyographic recordings while the animals were standing on a smooth or a rough surface of a platform in horizontal, vertical or inverted positions, as well as during rotations of the platform. We recorded tonic and phasic motor units. The tonic units were active all the time without significant differences in spike frequency, regardless of the position of the animals (although there was a tendency for higher discharge frequencies to occur during platform rotations). The phasic units were active almost exclusively during platform movement. In contrast to the tonic units, we detected significant differences in the activities of the phasic units; namely, higher spike frequencies during rotations compared with the stationary phases, especially for rotations into 'more awkward' positions. A comparison of the two species revealed no difference in muscle activity, despite differences in the animals' tarsal attachment structures. The same was true when comparing the muscle activity of the two species on both the smooth and the rough surfaces.
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