Question
Which muscles are supplied by the ulnar nerve?
| A. |
Dorsal interossei
|
| B. |
Abductor digiti minimi
|
| C. |
4th lumbrical
|
| D. |
All of the above
|
Show Answer
|
Correct Answer � D
Explanation
|
|
The ulnar nerve supplies a significant portion of the intrinsic muscles of the hand. These include:
-
Dorsal interossei – Responsible for abduction of fingers (DAB: Dorsal Abduct). All four dorsal interossei are innervated by the deep branch of the ulnar nerve.
-
Abductor digiti minimi – Part of the hypothenar muscle group; this muscle abducts the little finger and is supplied by the deep branch of the ulnar nerve.
-
Fourth lumbrical – The lumbricals of the hand are four in number. The first and second lumbricals (to the index and middle fingers) are supplied by the median nerve, while the third and fourth lumbricals (to the ring and little fingers) are supplied by the ulnar nerve. Hence, the fourth lumbrical is innervated by the ulnar nerve.
