The scapula, your shoulder blade, is a pretty darn awesome bone. There is just a lot going on here, as it supports your back and shoulder muscles, both of which are very large and powerful, along with the movement of your arm, which is a lot of movement. This is the front-side view of a left scapula, and you can see the acromion process where the clavicle articulates. The main feature on this side of the bone is the subscapular fossa (fossa means depression), which is home to the ridges you can see. These ridges serve as the attachments for many of the tendons in the shoulder girdle. At the top of the fossa, where the color changes from a lighter to darker color, is a deeper depression that increases the structural strength of the bone. The backside of this depression is where the spine of the scapula is...to be covered later!