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. 2015 Oct 14;115(1):255–270. doi: 10.1152/jn.00530.2015

Fig. 4.

Fig. 4.

Movement trajectories of the wrist and preferred directions of wrist prime movers in 2 forearm postures, fully pronated (PRO) and fully supinated (SUP) (see top insets). A: averaged movement trajectories to 8 peripheral targets for monkey S. The target locations required 20° changes in the angle of the wrist joint. Each trace represents an average of 10 trials. Up, up; Rt, right; Dn, down; Lf, left; Ex, extension; Fl, flexion; Ra, radial deviation; Ul, ulnar deviation. B: preferred direction (PD) of 3 prime movers of the wrist joint for monkey S. ECRB, extensor carpi radialis brevis; ECU, extensor carpi ulnaris; FCR, flexor carpi radialis. C: change in PDs of the muscles when posture was rotated from PRO (normalized to 0) to SUP, i.e., a subtraction between the 2 diagrams in B. The right inset shows the same data plotted as a histogram (bin width = 10°) and illustrates the method of deriving the histograms in Fig. 10.