19th February 2024

A 45-year-old male has fallen off his motorcycle in an accident and has fallen onto his shoulder with concurrent hyperextension of his neck.

A 45-year-old male has fallen off his motorcycle in an accident and has fallen onto his shoulder with concurrent hyperextension of his neck. He reports loss of sensation along the shoulder, lateral aspect of his arm, lateral forearm and thumb. He also noted weakness in arm flexion and shoulder abduction. The biceps reflex and supinator reflex are absent.

Which of the following nerve roots has likely been affected?