Trigger points in the Serratus anterior muscle can cause a variety of symptoms including pain referred across the chest and down the arm. They may also be the cause of scapula dysfunction.   Trigger Point Anatomy - Serratus Anterior          Winged Scapula is a problem that affects a small, but wide-ranging, part of the population The scapula, or shoulder blade, is the largest bone of the shoulder and has 17 different muscles attached to it. These muscles both stabilize the arm and allow it to move. The muscles move together like a well-oiled machine but when things...