Experimental setup and the resulting ultrasound sequences. (a) The passive movement (Example 1) was performed lying face down with the foot strapped to an isokinetic dynamometer. The ultrasound probe was then held in the researcher’s hand, just above the subject’s malleolus. (b) The anatomy of the calf viewed from the probe surface towards the interior of the calf. The marked anatomic areas are the areas discussed in Example 1. Figures (c) and (d) show the anatomical regions in the biceps considered in Example 2. (c) is the longitudinal capture and (d) is the transversal capture.