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Review Question - QID 8691

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QID 8691 (Type "8691" in App Search)
An 18-year-old football player is injured after making a tackle with his left shoulder. He has decreased sensation over the lateral aspect of the left shoulder and radial aspect of the forearm. Motor examination reveals weakness to shoulder abduction and external rotation as well as elbow flexion. He has decreased reflexes of the biceps tendon on the left side but full, nontender range of motion of the cervical spine. What anatomic site has been injured?

Fourth cervical nerve root

2%

12/776

Upper trunk of the brachial plexus

77%

594/776

Middle trunk of the brachial plexus

9%

66/776

Lateral cord of the brachial plexus

10%

77/776

Axillary nerve

3%

20/776

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The athlete has symptoms referable to the axillary, musculocutaneous, and suprascapular nerves resulting from an injury to the upper trunk of the brachial plexus. This portion of the plexus is formed by contributions of the fourth through sixth cervical nerve roots. This area is often contused or stretched following a tackling maneuver that results in either depression of the shoulder from contact at Erb’s point or traction of the upper plexus from forced stretching of the neck to the contralateral side.

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