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. 2018 Jun 4;6:e4921. doi: 10.7717/peerj.4921

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© 2018 Chen et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) Two-dimensional spinal cord model and the extruding direction to form the three-dimensional model. (B) The three-dimensional full spinal cord model with the stimulation electrode placed on the surface of the skin. The side length of the electrode is 1 cm. The surface highlighted in blue color is defined as the stimulation surface. (C) The spinal cord model with the return electrode. The side length of the return electrode is 5 cm. The surface highlighted in blue color is defined as the return surface. (D) The central cross-sectional surface of the spinal cord model across the centers of the stimulation surface and the return surface. (E) Detailed view of the cross-sectional surface of the spinal cord. A central line across the center of the stimulation surface and the return surface is defined in red. (F) Magnified view of the central parts of the spinal cord.