Question

A 22-year-old man is brought into the emergency department with a knife injury to the axilla. The physician suspects injury to the lower brachial plexus. Which of the following nerves will most likely be affected? please explain why

A. Axillary

B. Musculocutaneous

C. Vagus

D. Radial

E. Ulnar

Answer 1

Answer: (E) Ulnar

Rationale: It will affects the ulnar nerve. It is one of the essential nerve in the arm. The person had lower brachial injury, But the answer for the question is ulnar nerve. Because it has some connection.

The brachial plexus is begin from the cervical region (C5) to Thoracic region of T1. But in question it says that he had lower injury to the brachial plexus, so it cover the C8 to T1.

There are some nerve raised from these nerves. This nerve is called as option E. so ones the lower level of brachial plexus get affected it affects the option E.