Research on Morphology Specificity of Gecko Feet at Different Scales

Abstract:

The fine-level structure of toes contributes to the extraordinary climbing ability of G. gecko. Research on the morphology specificity of gecko feet at different scales provides anatomical information for revealing geckos motor ability and provides theoretical basis and data which can support the development of the robot gecko feet. During the research, we used KEYENCE (VHX-600E) digital microscope system to observe and photograph the forefoot and hindfoot of G. gecko at different scales. The image processing as well as calculation of foot area and toe area was done using image processing software after the number of toe setae lamella was counted. Results: there was no significant difference between the numbers of setae lamellae on the first toes in both forefoot and hindfoot (p>0.3). The same situation also appeared in the second and forth toes. Significant difference between the numbers of the third toe setae lamella in forefoot and hindfoot was observed, the same situation also happened in the fifth toes of the forefoot and hindfoot (p<0.01), the difference between the whole area of the forefoot and hindfoot was extremely significant (p<0.005). The area of the first toe in forefoot was different from the corresponding one in hindfoot (p<0.05), while the areas of the other four toes were extremely significant from the corresponding ones in hindfoot (p<0.005). The results of the research suggest that specific designs should be adopted in the devisal of forefoot and hindfoot as well as the corresponding toes.

• Periodical: Applied Mechanics and Materials (Volume 461)
• Pages: 284-290
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.461.284
• Online since: November 2013
• Authors: Lei Cai, Hao Mei, Wen Bo Wang, Hao Wang, Zhen Dong Dai
• Keywords: Area, Foot, Gekko gecko, Setae Lamella, Toes

References

[1] Y. Tian, N. Pesika, H.B. Zeng, K. Rosenberg, B.X. Zhao, P. McGuiggan, K. Autumn, J. Israelachvili, Adhesion and friction in gecko toe attachment and detachment, Proc. Natl. Acad. Sci. USA. 12 (2006) 19320-19325.

DOI: 10.1073/pnas.0608841103

[2] A.P. Russell, A contribution to the functional analysis of the foot of the Tokay, Gekko gecko (Reptilia, Gekkonidae). J. Zool. London. 176 (1975) 437-476.

DOI: 10.1111/j.1469-7998.1975.tb03215.x

[3] P.F.A. Maderson, Keratinized epidermal derivatives as an aid to climbing in gekkonid lizards, Nature. 203, (1964)780-781.

DOI: 10.1038/203780a0

[4] R. Ruibal, V. Ernst, The structure of the digital setae of lizards, J. Morphol. 117 (1965) 271-294.

DOI: 10.1002/jmor.1051170302

[5] N.E. Stork, Experimental Analysis of Adhesion of Chrysolina Polita (Chrysomelidae: Coleoptera) on a Variety of Surfaces, J. Exp. Biol. 88 (1980) 91-107.

DOI: 10.1242/jeb.88.1.91

[6] K. Autumn, Y.A. Liang, S.T. Hsieh, W. Zesch, W.P. Chan, W.T. Kenny, R. Fearing, R.J. Full, Adhesive force of a single gecko foot-hair, Nature. 405 (2000) 681-685.

DOI: 10.1038/35015073

[7] B. Chen, P.D. Wu, H. Gao. Hierarchical modelling of attachment and detachment mechanisms of gecko toe adhesion. Proc. R. Soc. A., 464 (2008): 1639-1652.

DOI: 10.1098/rspa.2007.0350

[8] K. Autumn, M. Sitti, Y.A. Liang, A.M. Peattie, W.R. Hansen, S. Sponberg, T.W. Kenny, R. Fearing, J.N. Israelachvili, R.J. Full, Evidence for van der Waals adhesion in gecko setae, Proc. Natl. Acad. Sci. USA. 99 (2002) 12252-12256.

DOI: 10.1073/pnas.192252799

[9] C. Guo, L. Cai, H.R. Xie, Z.Y. Wang, Z.D. Dai, J.R. Sun, Divisional and hierarchical innervations of G. gecko's toes to motion and reception, Chin. Sci. Bull. 54 (2009) 2880-2887.

DOI: 10.1007/s11434-009-0188-1

[10] D.J. Irschick, B. Vanhooydonck, A. Herrel, A. Andronescu, Effects of loading and size on maximum power output and gait characteristics in geckos. J. Exp. Biol. 206 (2003) 3923-3934.

DOI: 10.1242/jeb.00617

[11] K. Autumn, S.T. Hsieh, D.M. Dudek, J. Chen, C. Chitaphan. R.J. Full, Dynamics of geckos running vertically, J. Exp. Biol. 209 (2006) 260-272.

DOI: 10.1242/jeb.01980

[12] Z.Y. Wang, W.H. Gu, Q. Wu, A.H. Ji, Z.D. Dai, Morphology and reaction force of toes of geckos freely moving on ceilings and walls, Sci. China Technol. Sc. 53 (2010) 1688-1693.

DOI: 10.1007/s11431-010-3188-0

[13] Z.Y. Wang, J.T. Wang, A.H. Ji, Y.Y. Zhang, Z.D. Dai, Behavior and dynamics of gecko's locomotion: The effects of moving directions on a vertical surface, Chin. Sci. Bull. 56 (2011) 573-583.

DOI: 10.1007/s11434-010-4082-7

[14] Z.D. Dai, Z.Y. Wang, A.H. Ji, Dynamics of gecko locomotion: a force-measuring array to measure 3D reaction forces, J. Exp. Biol. 214 (2011) 703-708.

DOI: 10.1242/jeb.051144

[15] O. Unver, A. Uneri, A. Aydemir, M. Sitti, Geckobot: a gecko inspired climbing robot using elastomer adhesives, In: Proceedings of the 2006 IEEE International Conference on Robotics and Automation, 2006 May 15-19, Orlando, Florida, USA. IEEE, 2006, 2329-2335.

DOI: 10.1109/robot.2006.1642050

[16] D. Santos, B. Heyneman, S. Kim, N. Esparza, M.R. Cutkosky, Gecko-inspired climbing behaviors on vertical and overhanging surfaces, In: Proceedings of the 2008 IEEE International Conference on Robotics and Automation, 2008 May 19-23, Pasadena, CA, USA. IEEE, 2008, 1125-1131.

DOI: 10.1109/robot.2008.4543355

[17] D. Santos, S. Kim, M. Spenko, A. Parness, M. Cutkosky, Directional adhesive structures for controlled climbing on smooth vertical surfaces. In IEEE ICRA, Rome, Italy, 2007, 1262-1267.

DOI: 10.1109/robot.2007.363158