Which one of the following nerves is at risk of injury following fracture of shaft of humerus?

The nerve that is at risk of injury following a fracture of the shaft of the humerus is the Radial nerve.

Here's why:

1. The humerus is the bone in the upper arm, and it's surrounded by several important nerves.

2. The Radial nerve is one of these, and it runs very close to the shaft of the humerus.

3. Therefore, if the humerus is fractured, the Radial nerve is at risk of being damaged.

4. Damage to the Radial nerve can lead to symptoms such as weakness in the wrist and fingers, difficulty straightening the arm, and numbness or tingling in the hand or forearm.

5. Therefore, if a person has a fracture of the shaft of the humerus, doctors will often check for signs of Radial nerve damage.