Scapula Pterygoid

The pterygoid scapula is one of the paired bones of the shoulder girdle. It is usually classified as a derivative of the clavicle and, in general, served as an adaptation to the flight of birds, in which in phylogeny it retained a rudimentary wing rudiment. In humans, only part of the scapula has formed with a hook-shaped ending, which is attached to the greater tubercle of the humerus. In birds, the scapula is free, unfused not only with the collarbone, but also with the humerus. Only the small and large tubercles are fused with both parts of the skeleton, and the rest is called the collar (colli-ger). The fusion of the large tubercle with the skeleton should indicate that it was once completely free, which is also confirmed by the presence in it of a huge number of small joints (faculae) that support the folding of the skin over it. In humans there is no tubercle on the greater process of the scapula, but