Dynamic model of the octopus arm. I. Biomechanics of the octopus reaching movement.

@article{Yekutieli2005DynamicMO,
  title={Dynamic model of the octopus arm. I. Biomechanics of the octopus reaching movement.},
  author={Yoram Yekutieli and Roni Sagiv-Zohar and Ranit Aharonov and Yaakov Engel and Binyamin Hochner and Tamar Flash},
  journal={Journal of neurophysiology},
  year={2005},
  volume={94 2},
  pages={
          1443-58
        }
}
The octopus arm requires special motor control schemes because it consists almost entirely of muscles and lacks a rigid skeletal support. Here we present a 2D dynamic model of the octopus arm to explore possible strategies of movement control in this muscular hydrostat. The arm is modeled as a multisegment structure, each segment containing longitudinal and transverse muscles and maintaining a constant volume, a prominent feature of muscular hydrostats. The input to the model is the degree of… Expand
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The modeling suggests that the octopus arm biomechanics may allow independent control of kinematics and resistance to perturbation during arm extension movements. Expand
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TLDR
A control-oriented reduced order model based upon a novel parametrization of the curvature of the octopus arm is presented and compared using numerical simulations to lead to useful qualitative insights into bend propagation. Expand
Stereotypical reaching movements of the octopus involve both bend propagation and arm elongation.
TLDR
The analysis of the elongation profiles of the reaching movements of Octopus vulgaris revealed that, in addition to bend propagation, arm extension movements involve elongation of the proximal part of the arm, i.e., the section from the base of the hand to the propagating bend. Expand
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References

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The modeling suggests that the octopus arm biomechanics may allow independent control of kinematics and resistance to perturbation during arm extension movements. Expand
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