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Fig. 4.17 (A) Purely sagittal (flexion-extension) movements will engage the SFL as a whole. (B) Rotational movements through the hips
or trunk disengage the upper portion of the SFL from the lower.
Fig. 4.18 The rectus abdominis is the most superficial muscle of the abdomen all the way from the chest to the pubic bone. In terms of
fascial layering, however, the rectus begins as superficial at the 5th rib, but shortly dives under the external oblique fascia within a few
inches. Two inches (5 cm) lower than that, the internal oblique fascia splits to surround the rectus. Below the navel, the rectus slides
through behind the transversus abdominis at a hole at the arcuate line to become, by the time it reaches the pubic bone, the deepest
muscle of the abdomen. Such an understanding of fascial, as opposed to simply muscular, anatomy leads to different strategies for
'Spatial Medicine'.
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