MUSCULOCUTANEOUS NERVE
Lesions of the musculocutaneous nerve can result in all of the following, EXCEPT?
| A | Impaired sensation on the volar aspect of forearm | |
| B | Weakness in flexion of pronated forearm | |
| C |
Wasting of coracobrachialis muscle |
|
| D |
Wasting of biceps brachii muscle |
Lesions of the musculocutaneous nerve can result in all of the following, EXCEPT?
| A |
Impaired sensation on the volar aspect of forearm |
|
| B |
Weakness in flexion of pronated forearm |
|
| C |
Wasting of coracobrachialis muscle |
|
| D |
Wasting of biceps brachii muscle |
The weakness of flexion of the supinated forearm (not pronated) is a possibility in the nerve lesion of the musculocutaneous nerve.
Must know – Musculocutaneous nerve is a branch of the lateral cord of the brachial plexus and innervates the biceps brachii, brachialis, and coracobrachialis muscles. The origin of this nerve is from the fifth , sixth and seventh roots.
Motor: Lesions of the nerve result in wasting of these muscles and weakness of flexion of the supinated forearm.
Sensory: Sensation may be impaired along the radial and volar aspects of the forearm (lateral cutaneous nerve). Isolated lesions of this nerve are usually the result of a fracture of the humerus.
| A |
Loss of flexion of shoulder |
|
| B |
Loss of flexion at elbow |
|
| C |
Loss of supination of forearm |
|
| D |
Loss of sensation on radial side of forearm |
A i.e. Loss of flexion of shoulder
