Fig. 1 in Jumping and Grasping: Universal Locking Mechanisms in Insect Legs

Fig. 1. Generalized representation of an insect leg and modifications in the tibio-femoral joint for jumping and grasping.Two muscles connect the tibia and the femur.The tibial flexor (blue) bends (flexes) while the tibial extensor (brown) straightens (extends) the femoro-tibial joint.The tibial extensor is enlarged in a jumping legs (A), the two muscles are similar in their mass in walking legs (B), and the tibial flexor is enlarged in grasping legs (C).The locking mechanism between the tibial flexor muscle tendon and the ventral wall of the tibia is composed of the Heitler's lump (HL) and the genuflexor sclerite (GFS) in orthopterans (flexed (D) and extended (E) positions, modified after Gronenberg 1996; cx = coxa, tr = trochanter, tib = tibia, fem = femur, tar = tarsus; distal to the left).