**Core Concept**
The "winging" of the scapula refers to a condition where the scapula protrudes outward from the back, typically due to a weakness or paralysis of the muscles that stabilize the scapula against the thoracic wall. This condition can be caused by various factors, including nerve injuries or muscular dystrophies.

**Why the Correct Answer is Right**
The primary muscles responsible for scapular stability are the serratus anterior and the trapezius. Injury to the long thoracic nerve, which innervates the serratus anterior muscle, can lead to winging of the scapula. The long thoracic nerve originates from the C5-C7 nerve roots and runs along the lateral aspect of the thoracic wall, making it susceptible to injury during surgeries or traumatic events.

**Why Each Wrong Option is Incorrect**
* **Option A:** Injury to the subscapularis muscle, which is innervated by the upper and lower subscapular nerves, would lead to weakness in shoulder rotation and abduction, but not scapular winging.
* **Option B:** Injury to the supraspinatus muscle, which is innervated by the suprascapular nerve, would lead to weakness in shoulder abduction, but not scapular winging.
* **Option C:** Injury to the latissimus dorsi muscle, which is innervated by the thoracodorsal nerve, would lead to weakness in shoulder extension and adduction, but not scapular winging.

**Clinical Pearl / High-Yield Fact**
Remember that scapular winging can be a subtle sign of underlying nerve injury or muscular dystrophy, and a thorough examination of the scapular stabilizing muscles is essential for diagnosis.

**Correct Answer: C. Injury to the latissimus dorsi muscle.**