24 Questions
What is the range of elbow flexion in the coronal axis?
0 to 145 degrees
Which muscle is the strongest contributor to elbow flexion in supination?
Biceps brachii
What is the effect of isolated weakness of the brachioradialis on elbow flexion strength?
Larger effect when the forearm is pronated
What is the effect of a short biceps brachii on elbow extension and pronation range of motion?
Reduction in elbow extension and pronation range of motion
At what range of elbow flexion are the moment arms of the brachioradialis, biceps brachii, and brachialis almost at their greatest?
70-90 degrees
Which muscle is most active in semi-pronation?
Brachialis
What is the effect of isolated weakness of the brachialis on elbow flexion strength?
Decreased elbow flexion strength irrespective of forearm position
What is the effect of flexing the elbow during glenohumeral extension?
Improvement in glenohumeral extension range of motion
What occurs when the pronator teres and quadratus are weak?
A supinated position of the forearm
What is the range of flexion of the wrist joint?
80 degrees
Which muscle has the greatest wrist flexion torque potential?
Flexor carpi ulnaris
What is the effect of weakness of the flexor carpi ulnaris on wrist flexion?
Weakens the wrist flexion with ulnar deviation
What is the movement of the wrist joint in the coronal axis, in the anterior direction, when in anatomical position?
Flexion
Which muscle is not a primary wrist flexor?
Extensor pollicis brevis
What is the direction of the hand movement in the pounding phase of hammering?
Flexion and ulnar deviation
What is the effect of weakness of the pronator teres and quadratus on everyday functions?
Interferes with many everyday functions
What is the primary function of the supinator muscle?
Supination of the forearm
What happens to the distal end of the radius during forearm supination?
It moves from a medial position to a lateral position
Which muscle is recruited during high-power supination activities?
Biceps brachii muscle
What is the effect of a short supinator muscle on supination strength?
It weakens supination strength
What is the orientation of the palm of the hand during forearm supination?
Anteriorly
What is the role of the biceps brachii muscle during forearm supination?
It is a primary supinator
What is the effect of short antagonist muscles on supination range of motion?
It limits supination range of motion
At what elbow angle is the effectiveness of the biceps as a supinator greatest?
90°
This quiz covers the movement and muscles of the wrist joint, including the pronator teres and quadratus, and their effects on daily functions.
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