Abnormal scapula morphology Abnormality of the shoulder girdle musculature Scapular winging Scapular weakness SNOMEDCT_US:17211005 Winged scapulae Winged shoulder blade Scapula alata UMLS:C4072849 UMLS:C0240953 The serratus anterior muscle is responsible for controlling the scapula (shoulder blade), and weakness of this muscle (which may be caused by damage to the long thoracic nerve) can manifest as scular winging. Winged scapulas Abnormal protrusion of the scapula away from the surface of the back. HP:0000783 HP:0003691 MEDDRA:10067628