<prompt> Which muscle paralysis can cause Winging of scapula?Serratus anteriorSupraspinatusTeres minorDeltoid  <response>: Ans. a Serratus anterior Ref. Maheshwari orthopedics 4th56LONG THORACIC NERVE Arises from ventral rami of C5, C6, and C7. Descends behind the brachial plexus on the lateral surface of the serratus anterior, to which it supplies. The serratus anterior muscle can be examined by asking patient to push against a wall with both hands. Winging of scapula will be typically noted. 