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Fig. 5. Approximate line of action for selected hind limb muscles of the guinea
fowl. Blue solid lines and solid red lines indicate the lines of action for
stance and swing-phase muscles, respectively, that significantly increase
energy use in response to a load on the trunk. broken blue lines indicate
biarticular stance-phase muscles that had unchanged (FCLP, postIF and LG) or
decreased (IG) energy use in response to trunk loading. The small ambiens
muscle, which has a significant increase in flow
(Table 1), is not shown. The
lines of action are drawn to show the major actions of the muscles at the
joints, and do not necessarily indicate precisely the muscle origins and
insertions or to quantitatively indicate the moment arms. For muscles sharing
a similar line of action, only one line is shown. For the ankle extensors, a
common line of action is shown along the tibiotarsus, but separate lines
indicate origins and insertions where different.
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