A 17-year-old boy is brought to the emergency department after sustaining a high impact injury to his arm during a baseball game. He reports being hit in the right shoulder with a batted ball, causing immediate pain and swelling in that region. Physical examination of the right upper extremity is limited by the patient's pain, and full motor and sensory examination are unable to be performed. X-ray of the shoulder shows a fracture of the surgical neck of the humerus. Which of the following additional finding will most likely be seen in this patient?

A 66-year-old woman with a history of osteoarthritis is brought to the physician because of difficulty walking after being bed-bound for an extended period of time. Physical examination shows an inability to dorsiflex the right foot against resistance but shows normal strength with plantar flexion. At rest, the right foot is maintained in an inverted position. There is reduced sensation on the dorsum of the right foot but normal sensation on the sole of the foot. Which of the following nerves is most likely injured?

A 17-year-old boy is brought to the emergency department after sustaining a high impact injury to his arm during a baseball game. He reports being hit in the right shoulder with a batted ball, causing immediate pain and swelling in that region. Physical examination of the right upper extremity is limited by the patient's pain, and full motor and sensory examination are unable to be performed. X-ray of the shoulder shows a fracture of the surgical neck of the humerus. Which of the following additional finding will most likely be seen in this patient?

A 24-year-old man who is a construction worker comes to the physician because of awkwardness in using his left hand. He reports that two months ago he fell on his outstretched hand and landed on the heel of the hand. Physical examination shows that the 4th and 5th fingers are extended at the metacarpophalangeal joints and flexed at the interphalangeal joints. Which of the following additional findings is most likely to be seen on physical examination?

A 66-year-old man is involved in a motor vehicle collision. Upon arrival, paramedics stabilize the patient's neck then transport him to the emergency department. He says that he has neck pain that radiates down the right arm. Physical examination shows a loss of sensation in a small region of the lateral upper right arm. An MRI of the spine shows a herniated intervertebral disc impinging on the right C5 nerve roots. Which of the following movements will most likely be affected?