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| Description: Wings attach to the thorax at pivot points. When muscles inside the thorax contract and relax, the thorax changes shape and the wings pivot up and down at their attachment point. A. Wings pivot down as the relaxation of vertical muscle and the contraction of longitudinal muscle pull in sides of thorax. B. Wings pivot up when the contraction of vertical muscle and relaxation of longitudinal muscle flatten the thorax. Picture Stats: Views: 206 Filesize: 299.97kB Height: 999 Width: 1623 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47590 |