Figure 1: Schematic drawing of Abd muscles and their multisegmental innervation. L; lumbar nerve, T; thoracic nerve, EO; M. obliquus abdominis externus, LD; M. lattismus dorsi, RA; M. rectus abdominis, O; central cut ends of nerves dipped, ☐; three portions along the Th13 and L1 nerves sampled.