Podcast
Questions and Answers
What sensory loss is associated with a lesion just above the middle of the forearm?
What sensory loss is associated with a lesion just above the middle of the forearm?
What is the motor loss associated with a lesion at or just above the wrist?
What is the motor loss associated with a lesion at or just above the wrist?
What deformity is observed when the hand is at rest due to a lesion at or above the elbow?
What deformity is observed when the hand is at rest due to a lesion at or above the elbow?
Which muscles are supplied by the lateral division of the palmar cutaneous branch?
Which muscles are supplied by the lateral division of the palmar cutaneous branch?
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Which nerve is formed by the union of the lateral root of the lateral cord and the medial root of the medial cord of the brachial plexus?
Which nerve is formed by the union of the lateral root of the lateral cord and the medial root of the medial cord of the brachial plexus?
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What causes motor loss due to carpal tunnel syndrome?
What causes motor loss due to carpal tunnel syndrome?
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At what point does the median nerve cross in front of the brachial artery?
At what point does the median nerve cross in front of the brachial artery?
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Where does the median nerve become superficial and lie deep to the tendon of palmaris longus?
Where does the median nerve become superficial and lie deep to the tendon of palmaris longus?
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Which branch of the median nerve supplies the deep flexors of the forearm except the medial half of the flexor digitorum profundus?
Which branch of the median nerve supplies the deep flexors of the forearm except the medial half of the flexor digitorum profundus?
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Through which structure does the median nerve enter the hand?
Through which structure does the median nerve enter the hand?
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Study Notes
Sensory Loss
- A lesion just above the middle of the forearm is associated with sensory loss in the palmar surface of the hand.
Motor Loss
- A lesion at or just above the wrist causes motor loss affecting the thenar muscles, resulting in Opposition and thumb movements being affected.
Deformity
- A lesion at or above the elbow causes a deformity known as " claw hand" when the hand is at rest, due to unopposed flexion of the fingers and wrist.
Palmar Cutaneous Branch
- The lateral division of the palmar cutaneous branch supplies the thenar muscles.
Median Nerve Formation
- The median nerve is formed by the union of the lateral root of the lateral cord and the medial root of the medial cord of the brachial plexus.
Carpal Tunnel Syndrome
- Compression of the median nerve in the carpal tunnel causes motor loss affecting the thenar muscles.
Median Nerve Path
- The median nerve crosses in front of the brachial artery at the level of the elbow crease.
- The median nerve becomes superficial and lies deep to the tendon of palmaris longus in the middle of the forearm.
- The anterior interosseous branch of the median nerve supplies the deep flexors of the forearm except the medial half of the flexor digitorum profundus.
- The median nerve enters the hand through the carpal tunnel.
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Description
Learn about the formation, course, and relations of the median nerve in the axilla, arm, and forearm. Understand its roots, trajectory alongside the brachial artery, and position in the cubital fossa.
