HEAD NECK
CRANIAL CAVITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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rotation with axis of bone away from body, as when the humerus is turned outward
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rotation with axis of bone away from body, as when the humerus is turned outward
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rotation on axis of bone, specifically applied to the forearms, as in turning hand down by rotating radius on the ulna
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rotation on axis of bone, specifically applied to the forearms, as in turning hand down by rotating radius on the ulna
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Detailed explanation-1: -Pronation is the motion that moves the forearm from the supinated (anatomical) position to the pronated (palm backward) position. This motion is produced by rotation of the radius at the proximal radioulnar joint, accompanied by movement of the radius at the distal radioulnar joint.
Detailed explanation-2: -Forearm pronation is rotation of the radius so the palm faces anteriorly (away from the anatomical position). It occurs primarily at the proximal radioulnar joint. Gravity also assists pronating the elbow. It is the opposite of forearm supination.
Detailed explanation-3: -The radius articulates with the ulna in a synovial pivot joint. The radial head rotates within the annular ligament and radial notch on the ulna to produce pronation of the forearm.