Question
A young boy presents with multiple humerus fractures, resulting in loss of sensation over the lateral side of the forearm, along with difficulty in elbow flexion and forearm supination. What is the most likely nerve injury responsible for these symptoms?
| A. |
Musculocutaneous nerve
|
| B. |
Median nerve
|
| C. |
Axillary
|
| D. |
Radial nerve
|
Show Answer
|
Correct Answer � A
Explanation
|
|
Musculocutaneous Nerve:
– Motor: Innervates coracobrachialis, biceps brachii & brachialis muscles. Injury → ↓ elbow flexion & supination.
– Sensory: Provides sensation to the lateral forearm via the lateral cutaneous nerve.
Incorrect Options:
– Median Nerve: Affects wrist flexion & thumb opposition, not elbow flexion or forearm sensation.
– Axillary Nerve: Innervates the deltoid for shoulder abduction, not elbow or forearm function.
– Radial Nerve: Controls arm extension (“wrist drop” if damaged), not lateral forearm sensation.
