Question

1. A 22-year-old male comes to the emergency department after sustaining a fall in a construction site, after proper evaluation you notice that the patient has lack of sensation over the lateral aspect of the forearm, inability to abduct the upper limb and inability to flex the forearm. Which of the following is the most likely location of this patient’s injury?
   1. Musculocutaneous nerve
   2. C5-C6 Nerve roots
   3. Axillary nerve
   4. Medial brachial cutaneous nerve
   5. Ulnar nerve
2. A 36-year-old male comes to the office complaining of lack of sensation in the medial aspect of the arm and forearm and a few other symptoms. Which of the following is the most likely location of this patient’s injury?
   1. Medial brachial cutaneous nerve
   2. Ulnar nerve
   3. Radial nerve
   4. Medial cord
   5. Axillary nerve
3. A 19-year-old male comes to the ED after being stabbed in a space limited by the teres major and minor, the humerus and the long head of the triceps. Which of the following signs do you expect to find in the physical evaluation?
   1. Lack of flexion of the forearm
   2. Lack of sensation over the lateral aspect of the arm
   3. Lack of adduction of the arm
   4. Lack of sensation over the medial aspect of the forearm
   5. Lack of sensation over the clavicle

4. A 22-year-old male comes to the ED after being stabbed in the axillary fossa. After stabilization and proper surgical evaluation an injury the portion of the brachial plexus lateral to the axillary artery. Which of the following signs do you expect to find in the physical evaluation?
   1. Weakness of supination of the forearm
   2. Lack of sensation of the medial aspect of the arm
   3. Lack of sensation of the medial aspect of the forearm
   4. Lack of extension of the forearm
   5. Lack of sensation of the lateral aspect of the arm

Answer 1

1) A) Musculocutaneous nerve

Musculocutaneous nerve is so named as it supplies muscles of front of arm and skin of lateral side of forearm.

It supplies coracobrachialis pierces the muscle to lie in f intermuscular septum between biceps brachii ai brachialis muscles, both of which are supplied by | this nerve. At the crease of elbow it becomes cutaneous. The nerve is called the lateral cutaneous nerve of forearm which supplies skin of lateral side of forearm both on the front and back.

2)A) Medial brachial cutaneous nerve

Explanation :

The medial brachial cutaneous nerve is distributed to the skin on the medial brachial side of the arm.

3) B) Lack of sensation over the lateral aspect of the arm

Explanation :in between teres major and teres minor, axillary nerve runs. It supplied lateral aspect of arm over deltoid muscle.

4) A) weakness of supination of forearm

Explanation :injury to Musculocutaneous nerve lying lateral to axillary artery in axillary fossa