Brachial Plexus

A 28-year-old male presents with a motorcycle accident injury causing a traction injury to the right upper limb. On examination, he has loss of abduction and external rotation of the shoulder, with winging of the scapula. Which nerve of the brachial plexus is most commonly injured in such traction injuries?

A 28-year-old man sustains a motorcycle injury with a traction injury to the right upper limb. Examination reveals loss of shoulder abduction, loss of sensation over the lateral shoulder, and inability to externally rotate the shoulder. All of the following nerves are likely damaged in this injury EXCEPT:

A 28-year-old male motorcyclist sustains a traction injury to the right brachial plexus during a high-speed collision. On examination, he has weakness of wrist and finger flexion, loss of hand grip strength, and a claw hand deformity. Sensation is lost over the medial aspect of the forearm and hand. Which nerve root injury best explains this clinical picture, and what is the most reliable distinguishing feature from a complete upper trunk injury?

A 52-year-old man presents to the orthopedic clinic with a 3-month history of progressive wasting of the thenar and hypothenar eminences bilaterally. He reports a history of cervical rib on the left side, which was noted on chest X-ray. On examination, he has claw hand deformity affecting the 4th and 5th digits bilaterally, with sensory loss over the medial aspect of both forearms. He denies any neck trauma or birth injury. What is the anatomical basis for this bilateral presentation?

A 28-year-old motorcyclist sustains a severe traction injury to the right upper limb with the arm abducted and extended at the time of injury. Clinical examination reveals loss of abduction and external rotation of the shoulder, with preserved elbow flexion and wrist extension. Which nerve root(s) of the brachial plexus is/are most likely injured?