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Axilla and Brachial Plexus
Quiz by Jenny Ousley
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 A 21-year-old patient has a lesion of the upper trunk of the brachial plexus (Erb–Duchenne paralysis). Which of the following is the most likely diagnosis?
A patient comes in with a gunshot wound and requires surgery in which his thoracoacromial trunk needs to be ligated. Which of the following arterial branches would maintain normal blood flow?
A 29-year-old man comes in with a stabwound, cannot raise his arm above horizontal, and exhibits a condition known as “winged scapula.” Which of the following structures of the
brachial plexus would most likely be damaged?
A 27-year-old patient presents with an inability to draw the scapula forward and downward because of paralysis of the pectoralis minor. Which of the following would most likely
be a cause of his condition?
A 21-year-old woman walks in with a shoulder and arm injury after falling during horseback riding. Examination indicates that she cannot adduct her arm because of paralysis of which of the following muscles?
An 18-year-old boy involved in an automobile accident presents with an arm that cannot abduct. His paralysis is caused by damage to which of the following nerves?
A 23-year-old man complains of numbness on the medial side of the arm following a stab wound in the axilla. On examination, he is diagnosed with an injury of his medial brachial cutaneous nerve. In which of the following structures are the cell bodies of the damaged nerve involved in numbness located?
A patient has a torn rotator cuff of the shoulder joint as the result of an automobile accident. Which of the following muscle tendons is intact and has normal function?
A patient bleeding from the shoulder secondary to a knife wound is in fair condition because there is vascular anastomosis around the shoulder. Which of the following arteries is most likely a direct branch of the subclavian artery that is involved in the anastomosis?
A 20-year-old man fell from the parallel bar during the Olympic trial. A neurologic examination reveals that he has a lesion of the lateral cord of the brachial plexus. Which of the following muscles is most likely weakened by this injury?
A 7-year-old boy falls from a tree house and is brought to the emergency department of a local hospital. On examination, he has weakness in rotating his arm laterally because of an
injury of a nerve. Which of the following conditions is most likely to cause a loss of this nerve
function?
A rock climber falls on his shoulder, resulting in a chipping off of the lesser tubercle of the humerus. Which of the following structures would most likely have structural and functional damage?
A 37-year-old female patient has a fracture of the clavicle. The junction of the middle and lateral thirds of the bone exhibits overriding of the medial and lateral fragments. The arm is rotated medially, but it is not rotated laterally. The lateral portion of the fractured clavicle is displaced downward by which of the following?
37-year-old female patient has a fracture of the clavicle. The junction of the middle and lateral thirds of the bone exhibits overriding of the medial and lateral fragments. The arm is rotated medially, but it is not rotated laterally. Which of the following muscles causes upward displacement of the medial fragment?
A 23-year-old man comes to the physician because of pain in the right upper extremity for several weeks. The pain is sharp, exacerbated by movement, and is progressively worsening since he increased his training for the upcoming basketball season. Examination of the right upper extremity shows no deformity. The pain is reproduced during the initial phase of abduction of the right arm, and when the arm is abducted against resistance. There is weakness in lateral rotation of the right shoulder. Which nerve was most likely injured?