Question
In the provided image, which nerve supplies the marked structure?
| A. |
Radial nerve
|
| B. |
Median nerve
|
| C. |
Ulnar nerve
|
| D. |
Musculocutaneous nerve
|
Show Answer
|
Correct Answer � B
Explanation
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|
The structure marked in the image, presumably depicts 1st lubrical which is innervated by the median nerve.
The median nerve innervates the first and second lumbricals (those associated with the index and middle fingers), while the ulnar nerve innervates the third and fourth lumbricals (associated with the ring and little fingers).
High Yield Points: The Lumbricals of the Hand :
The lumbricals are intrinsic muscles of the hand. There are four lumbricals – each associated with a digit.
Attachments: Originates from the tendon of the flexor digitorum profundus. Inserts onto the radial aspect of the extensor hood of each digit.
Actions: Flexion at the metacarpophalangeal joint and extension at the interphalangeal (IP) joints.
Innervation:
- Lateral two lumbricals (of the index and middle fingers) are innervated by the median nerve.
- Medial two lumbricals (of the little and ring fingers) are innervated by the ulnar nerve.
Blood supply: Superficial and deep palmar arches
