Find the number of degrees of freedom of your arm, from yourtorso to your palm (just past the wrist, not including finger degrees of freedom).Keep the center of the ball-and-socket joint of your shoulder stationary (do not“hunch” your shoulders). Find the number of degrees of freedom
Question
Find the number of degrees of freedom of your arm, from yourtorso to your palm (just past the wrist, not including finger degrees of freedom).Keep the center of the ball-and-socket joint of your shoulder stationary (do not“hunch” your shoulders). Find the number of degrees of freedom
Solution
The human arm, from the torso to the palm, has seven degrees of freedom. Here's how:
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Shoulder Flexion/Extension: This is the forward and backward movement of the arm at the shoulder joint.
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Shoulder Abduction/Adduction: This is the movement of the arm away from and towards the body at the shoulder joint.
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Shoulder Internal/External Rotation: This is the rotation of the arm around its long axis at the shoulder joint.
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Elbow Flexion/Extension: This is the bending and straightening of the arm at the elbow joint.
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Forearm Pronation/Supination: This is the rotation of the forearm so that the palm faces up or down.
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Wrist Flexion/Extension: This is the bending and straightening of the hand at the wrist joint.
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Wrist Ulnar/Radial Deviation: This is the movement of the hand towards the ulna (little finger side) or the radius
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