Our shoulder blades are flat bones that lie on the back of our ribcage and are very mobile. Why are they so mobile? The shoulder blades are not attached to the vertebrae in any way. The only bony attachment shoulder blades have to our skeleton is to our clavicle (collar bone) by means of our acromium process (the bony bits on top of each of your shoulders.) As a result our shoulder blades are very mobile.
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