Podcast
Questions and Answers
Damage to which nerve is most likely to be caused by a knife wound and result in weakened elbow flexion?
Damage to which nerve is most likely to be caused by a knife wound and result in weakened elbow flexion?
- Musculocutaneous nerve (correct)
- Ulnar nerve
- Median nerve
- Axillary nerve
Which group of muscles becomes paralyzed following a complete musculocutaneous nerve injury?
Which group of muscles becomes paralyzed following a complete musculocutaneous nerve injury?
- Supinator, pronator teres, flexor carpi ulnaris
- Extensor carpi radialis longus, brachioradialis, extensor digitorum
- Deltoid, teres minor, triceps brachii
- Coracobrachialis, biceps brachii, brachialis (correct)
What functional deficits can be observed in a patient with a musculocutaneous nerve injury?
What functional deficits can be observed in a patient with a musculocutaneous nerve injury?
- Weakness in elbow flexion, shoulder flexion, and forearm supination (correct)
- Inability to flex the wrist and fingers
- Inability to perform shoulder abduction and lateral rotation
- Inability to oppose the thumb and index finger
Apart from motor deficits, what sensory alteration arises from musculocutaneous nerve damage?
Apart from motor deficits, what sensory alteration arises from musculocutaneous nerve damage?
Which movement of the forearm is most significantly weakened in a patient with an isolated musculocutaneous nerve lesion?
Which movement of the forearm is most significantly weakened in a patient with an isolated musculocutaneous nerve lesion?
Flashcards
Musculocutaneous Nerve Injury
Musculocutaneous Nerve Injury
An injury that affects elbow flexion and sensation in the forearm.
Affected Muscles
Affected Muscles
Coracobrachialis, biceps brachii, and brachialis are paralyzed.
Elbow Flexion Weakness
Elbow Flexion Weakness
Injury leads to significantly weakened elbow and shoulder flexion.
Forearm Supination Weakness
Forearm Supination Weakness
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Loss of Sensation
Loss of Sensation
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Study Notes
Musculocutaneous Nerve Injury
- Usually caused by a weapon like a knife
- Causes paralysis of the coracobrachialis, biceps brachii, and brachialis muscles
- Results in severely weakened elbow flexion, shoulder flexion, and forearm supination
- Leads to a loss of sensation on the lateral side of the forearm
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