What secondary motions do the extensor pollicis longus, pollicis brevis, and abductor pollicis longus cause at the wrist? What synergy do they require to function effectively as thumb extensors?
What will be an ideal response?
ANS:
These muscles cross the wrist joint posteriorly and radially. Although their extensor action is weak, they are moderately effective radial deviators. If strong thumb extension is required, a synergist will be recruited to prevent the unwanted radial deviation and maintain length-tension for thumb extension.
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Fill in the blank(s) with the appropriate word(s).
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A. the flow schedule B. the wave schedule C. the surgery schedule D. fixed office hours