Nerve Injuries
A 25-year-old man presents with weakness of elbow flexion and numbness over the lateral forearm after a motorcycle accident causing shoulder dislocation. Examination reveals absent biceps reflex, weakness of elbow flexion (especially with forearm supinated), weakness of supination, and sensory loss over the lateral forearm. Shoulder function appears intact. Regarding musculocutaneous nerve injury:
Mark each as TRUE or FALSE
The musculocutaneous nerve arises from the lateral cord of the brachial plexus (C5, C6, C7) and pier...
Causes of injury include: shoulder dislocation (stretch injury), fractures of the humerus, penetrati...
The musculocutaneous nerve arises from the medial cord; it does not pierce any muscle; it only inner...
Clinical features include: weakness of elbow flexion (especially with forearm supinated), weakness o...
Treatment depends on mechanism: observation for neurapraxia (most recover spontaneously), nerve repa...
Answer the questions to see explanations
Click T (True) or F (False) for each option