The force exerted by the anterior pterygoid upon the mandible when fully lowered most nearly approached the perpendicular to the long axes of the mandibular rami, and the resultant force acting on the mandible was adductive. [Please select]
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The adductive component of force therefore decreased as the jaw swung upward, with the result that the anterior pterygoid could only have been active in initiating adduction and not in sustaining it. [Please select]
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The anterior pterygoid aided in initiating adduction in _Captorhinus_, whereas in _Dimetrodon_ this muscle was adductive throughout the swing of the jaw. [Please select]
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The curvature of the jaw transforms the anterodorsal pull of the muscle into a dorsally directed adductive movement regardless of the initial angle of the jaw. [Please select]
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