Injury to radial nerve in lower part of spiral groove-
Correct Answer: Leaves extensions at elbow joint intact
Description: 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.
Category:
Anatomy
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