Schematic representation of the cross-section of the 3DM of the vocal folds. The stiffness of anchor springs, longitudinal springs and vertical springs are indicated with , , with s=1,…,5 from inferior to superior. The subscript r means the lateral right side of the vocal fold (i=1,…,5). Likewise, the stiffness of different springs on the lateral left side are symbolized as , , , with index i=6,…,10. The thickness of the mass element located in plane s is labeled as hs. The position of the mass element mi,s is denoted with 3D-components xi,s, yi,s, zi,s. The damping ri,s for each mass element is not shown so as to keep clarity of the drawing.