Fig. 3. (A) Relationship between muscle resting length and femur length in front leg (F; squares), middle leg (M; circles) and hind leg (H; triangles). Filled symbols, extensor tibiae; open symbols, flexor tibiae. The dotted lines give the linear fit under the assumption of pure proportionality between muscle length and femur length. The solid line indicates the 1:1 proportion, for comparison. Values are shown in Table 1. (B) Relation between middle leg muscle resting length and fibre length. Extensor muscle fibre length depends on resting muscle length (P<0.03), whereas no such dependence is present in the flexor muscle (dotted regression lines). Open, fibres in muscle medial regions; filled circles, fibres in muscle proximal regions. Values are means ± s.d. from nine experiments.