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Part 2 Serratus Anterior Muscle

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The serratus anterior is a large flat sheet of muscle that covers the side of the thorax and is sandwiched between the ribs and the scapula (shoulder blade). Its main action is to protract the scapula (glide it forward around the chest wall). It also plays a vital role in stabilising the scapula during arm movements, and holds the medial border of the scapula against the chest wall. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ When the serratus anterior is weak/underactive the scapula tends to poke out off the ribcage at the back, a phenomenon known as “scapula winging”. A recent study (Uga et al., 2016) demonstrated that “in obviously abnormal shoulders, the serratus anterior is poorly recruited, weakening the shoulder external rotation strength.” These results concur with multiple studies examining the role of the serratus anterior in painful and dysfunctional shoulders. So what does this mean for shoulder pain?? We need to get the serratus anterior muscle firing again! (Are you starting to see the pattern

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