Multiple Choice
What motion is ONLY possible at the thumb?
8. Joints
Joint Movements
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__________ refers to movement of the radius around the ulna when the palms of the hands are rotated so that the palms are facing upward.
A
Circumduction
B
Abduction
C
Pronation
D
Supination
Verified step by step guidance1
Understand the anatomical terms involved: The problem is asking about a specific movement of the forearm involving the radius and ulna bones.
Identify the bones: The radius and ulna are the two long bones in the forearm. The radius is on the thumb side, and the ulna is on the pinky side.
Define the movement: Supination is the movement that rotates the forearm so that the palm faces upward or forward. This involves the radius rotating around the ulna.
Differentiate from other terms: Circumduction involves a circular movement of a limb, abduction is the movement away from the midline of the body, and pronation is the opposite of supination, where the palm faces downward.
Conclude with the correct term: Based on the description of the movement where the palms face upward, the correct term is 'Supination'.
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