Q.12
Ulnar nerve injury causes -
a) Weakness of adduction of thumb
b) Forment's sign
c) Thenar eminence atrophy
d) Pointing index
e) 4th and 5th finger clawing
A. acd
B. abe
C. cde
D. bcd
Explanation :
Ulnar nerve injury causes
- Paralysis of all interossei
- Medial two lumbricals paralysis
- Hypothenar muscles paralysis
- Adductor pollicis paralysis
- Flexor carpi ulnaris paralysis
- Medial two slips of flexor digitorum profundus paralysis
- Ulnar claw hand
Q.13
Wrist drop is due to injury of -
A. Radial nerve
B. Musculocutaneous nerve
C. Median nerve
D. Ulnar nerve
Explanation :
Radial nerve injury
- High radial nerve palsy- Injury above the spiral groove.
- Paralysis of all muscles supplied by radial nerve.
- Clinical features
:- Wrist drop, finger drop, thumb drop
:- Extension affected of- elbow, wrist, thumb and fingers
:-. Sensation affected of- posterior surface of arm and forearm and lower lateral half of forearm.
Low radial nerve palsy- Injury below the spiral groove.
-Type I- Injury between spiral groove and elbow.
:- Elbow extensors are spared- Triceps and Anconeus.
:- Wrist thumb and finger extensors paralysed- wrist drop, thumb drop, finger drop.
:- Loss of sensation on dorsal side of first web space.
- Type II- Injury below the elbow joint.
:- Elbow and wrist extensors spared
:- Thumb and finger extensors paralysed.(extensor digitorum, extensor digiti minimi, extensor indicis, extensor pollicis longus, extensor pollicis brevis)- Thumb drop and finger drop.
:- Loss of sensation on dorsal side of first web space.