A 15-Year-Old Boy Comes to the Office Due to Right

A 15-year-old boy comes to the office due to right arm numbness.  He plays on his high school baseball team and has been intensively practicing his pitching for an upcoming game.  For the past several weeks, the patient has had fluctuating tingling and numbness involving the right shoulder, arm, and hand.  He also has recently developed dull pain in the right little finger and hand.  The symptoms worsen with overhead activities and when throwing a baseball.  The patient has no medical problems other than being told that he has an extra rib.  On examination, there is right-sided weakness of the intrinsic hand muscles.  Which of the following muscles is most likely contributing to this patient's condition?

A) Coracobrachialis muscle
B) Scalene muscles
C) Subscapularis muscle
D) Teres major muscle
E) Triceps brachii

Correct Answer:

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