What is winged (alar) scapula?
- It refers to the winged (angelic) scapula in a living body. This is caused by paralysis of the long thoracic nerve, which innervates the serratus anterior muscle between the lateral thorax (1st -- 9th ribs) and the medial border of the scapula. The serratus anterior muscle slides the scapula forward along the thorax.