Figure 3. Reconstructions of the tibialis anterior muscle belly, central aponeurosis and muscle fascicles at rest.

(A) Individual example of a tibialis anterior (TA) muscle belly reconstruction (red) with a transverse cross-section (light blue) of the muscle reconstruction illustrating how muscle thickness and width measures were made. (B) Individual example of a TA central aponeurosis reconstruction (dark blue) with a birds-eye view illustrating how central aponeurosis width and length measures were made. Each image in (A) and (B) is represented in the coordinate system defined by the principal component analysis of the central aponeurosis. (C) Individual example of a reconstructed sagittal plane image re-slice of the TA muscle. The best sagittal plane image re-slice was determined visually as the image that displayed the clearest most continuous muscle fascicles. Three fascicles in the superficial and deep muscle compartments were analysed in the fascicle region outlined.