BIO325H5 Lecture Notes - Lecture 9: Tergum, Elastic Energy, Emmanuel Chabrier
Document Summary
Shape change in the tergum (reduced convexity centrally, with outward and downward movement at the tergalmargins) is brought about by the tergosternals. The paths followed by forces: a goal of this course is to associate form with force --to look at a structure and imagine the paths taken within it by forces. The force path starts with the dorsal longitudinal spulling on fore and aft phragmas; the force these muscles create then moves from phragmas into the notum and pleuron of the thoracic box". Here it becomes subdivided into multiple forces acting at different locations and altered in direction by differences in exoskeletal stiffness, thickness. One force is exerted at the wing bases as the dome-shaped notum pushes out laterally to right and left. Another force is exerted by the rotation of the scutellar lever: it tips up at the wing base shifting the relative position of the axillary sclerites(especially the 2 ax).
