Podcast
Questions and Answers
What structure does the median nerve pass under as it enters the hand?
What structure does the median nerve pass under as it enters the hand?
- Pisiform bone
- Trapezoid bone
- Flexor retinaculum (correct)
- Scaphoid bone
Which muscles are supplied by the median nerve distal to the carpal tunnel?
Which muscles are supplied by the median nerve distal to the carpal tunnel?
- Two thenar muscles and the 3rd lumbrical
- Two and a half thenar muscles and 1st and 2nd lumbricals (correct)
- All thenar muscles and all lumbricals
- Three thenar muscles and 2nd to 4th lumbricals
What does the palmar cutaneous branch of the median nerve supply?
What does the palmar cutaneous branch of the median nerve supply?
- The proximal phalanx of the fingers
- The central palm (correct)
- The dorsal aspect of the hand
- The entire palmar surface of the hand
Which digits receive sensory innervation from the median nerve?
Which digits receive sensory innervation from the median nerve?
Which bones form the borders of the carpal tunnel?
Which bones form the borders of the carpal tunnel?
Flashcards
Median nerve path
Median nerve path
The median nerve passes through the carpal tunnel, then supplies muscles and skin in the hand.
Carpal tunnel location
Carpal tunnel location
The carpal tunnel is a passage under the flexor retinaculum, between specific wrist bones.
Median nerve branches
Median nerve branches
The median nerve in the hand branches to muscles and sensory areas of the hand.
Sensory function
Sensory function
The median nerve provides feeling to parts of the palm and fingers.
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Palmar cutaneous branch
Palmar cutaneous branch
A branch of the median nerve that supplies feeling to the palm, but not through the carpal tunnel.
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Median Nerve Pathway in the Hand
- The median nerve passes through the carpal tunnel.
- The carpal tunnel is located deep to the flexor retinaculum.
- The tunnel is bordered by the scaphoid and trapezoid bones laterally and the pisiform and hamate bones medially.
- The median nerve travels alongside nine flexor tendons (FDS, FDP, FPL).
- Distal to the tunnel, the median nerve innervates two and a half thenar muscles and the first two lumbrical muscles.
- Sensory fibers from the median nerve supply the palm, sides of the first three fingers, half of the fourth finger, and distal portions of the corresponding dorsal surfaces.
- The palmar cutaneous branch of the median nerve, which supplies the central palm, originates proximal to the flexor retinaculum and travels superficially to it; therefore, it does not pass through the carpal tunnel.
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