Which of the following abdominal muscles would be active during trunk rotation to the right?
a. Right internal oblique, right external oblique
b. Left internal oblique, left external oblique
c. Right internal oblique, left external oblique
d. Left internal oblique, right external oblique
ANS: D
Rotation of the trunk occurs when the ipsilateral external oblique muscle and contralateral internal
oblique muscle contract at the same time. For rotation to the right, this would mean contraction of
the right external oblique and left internal oblique.
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