Which nerve needs to be preserved to maintain function of the serratus anterior muscle?

• A. Medial pectoral nerve
• B. Thoracodorsal nerve
• C. Long thoracic nerve
• D. Lateral pectoral nerve

Answer: (C)

The preservation of the long thoracic nerve is crucial for maintaining the function of the serratus anterior muscle. The serratus anterior is responsible for protracting the scapula, which is essential for various shoulder movements, including raising the arm above the head. The long thoracic nerve innervates the serratus anterior, and any damage or injury to this nerve can lead to weakness or paralysis of the muscle. This can result in winging of the scapula, where the scapula protrudes away from the back, affecting the overall mechanics and stability of the shoulder during movement. Proper functioning of the serratus anterior is vital for shoulder stability, especially during overhead activities. Thus, ensuring the long thoracic nerve remains intact during surgical procedures or trauma is key to preserving the muscle's function.