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 |
Weakness of flexion of supinated forearm (not pronated) is a possibility in the nerve lesion of 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 and sixth cervical 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 fracture of the humerus.
All of the following are features of musculocutaneous nerve injury at axilla except :
| 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 |
All of the following are features of musculocutaneous nerve injury at axilla except :
| 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
