Anatomy of shoulder blades

The spatula was created for two purposes. One of them is that the shoulder and arm should be suspended from it, and the shoulder would not be adjacent to the chest; then the freedom of movement of one hand to the other would be bound and constrained. On the contrary, the shoulder is created not connected with the ribs and the range of movements for it in both directions is expanded.

Second utility: the shoulder blade should be a reliable protection for the organs contained in the chest. It replaces the spines and wings of the vertebrae in those places where there are no vertebrae that resist impacts, and there is no sense that would sense them. The scapula thins outward and thickens inward, so that at its outer end a shallow depression is formed into which the rounded end of the humerus fits.

The scapula has two processes. One of them is directed upward and backward and is called the “holey” or “crow’s beak”; this process connects the scapula with the collarbone and prevents upward dislocation of the humerus. Another process, directed from the inside and downwards, also prevents dislocation of the head of the humerus. Further, the blade, moving inward, constantly expands so that its protective coverage is greater. On the back of the shoulder blade there is a process similar to a triangle, the base of which is directed to the outside, and the angle to the inside, so as not to damage the surface of the back, for if the base were directed inward, it would undoubtedly raise the skin and cause pain if blow. This process takes the place of a spine on a vertebra and is created for protection; it is called the “eye of the scapula.” The limit of expansion of the scapula is at the cartilage adjacent to it with a rounded end. It is connected with it for the reason mentioned in the description of other cartilages.