Question
A patient had a lesion in the wrist. On examination the thumb was laterally rotated & adducted with ape thumb deformity. Which nerve is commonly involved?
| A. |
Median
|
| B. |
Ulnar
|
| C. |
Radial
|
| D. |
Posterior interosseous Nerve
|
Show Answer
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Correct Answer � A
Explanation
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|
Answer A) Median
Ape hand deformity is a deformity in humans who cannot move the thumb away from the rest of the hand. It is an inability to abduct the thumb.
Abduction of the thumb refers to the specific capacity to orient the thumb perpendicularly to the ventral (palmar) surface of the hand.
The Ape Hand Deformity is caused by damage to the distal median nerve (also called a Median Claw lesion), and subsequent loss of opponens pollicis muscle function. The name “ape hand deformity” is misleading, as apes have opposable thumbs.
It can occur with an injury of the median nerve either at the elbow or the wrist, impairing the thenar muscles and opponens pollicis muscle.
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