Question

A small boy with multiple fracture of Humerus following which there is loss of sensation over lateral side of forearm, difficulty in flexion of elbow & supination of forearm.

• A. Musculocutaneous nerve
• B. Median nerve
• C. Median nerve
• D. Radial nerve

Answer 1

The Correct Option is A

The small boy in the scenario is experiencing a loss of sensation over the lateral side of the forearm, difficulty in flexion of the elbow, and challenges in supination of the forearm following a fracture of the humerus. These symptoms can be attributed to damage to a specific nerve.
The affected actions and loss of sensation are primarily associated with the musculocutaneous nerve. This nerve is responsible for innervating the anterior muscles of the arm, such as the biceps brachii and brachialis, which are crucial for flexion of the elbow and supination of the forearm. Additionally, it provides sensory innervation to the lateral aspect of the forearm.
Upon reviewing the symptoms:

• Loss of sensation over the lateral side of the forearm: The musculocutaneous nerve supplies cutaneous sensation to this area.
• Difficulty in flexion of elbow: The musculocutaneous nerve innervates the muscles responsible for elbow flexion.
• Supination of the forearm: One of the muscles it innervates, the biceps brachii, aids in forearm supination.

Hence, the symptoms align with an injury to the musculocutaneous nerve.