Shoulder blade—scapula.
Source: Vectorized in Inkscape by User:Mysid, based on http://training.seer.cancer.gov/module_anatomy/popup_illustrations/images/illu_pectoral_girdles.jpg. http://en.wiktionary.org/wiki/File:Pectoral_girdles-en.svg
Author: Original by National Cancer Institute; SVG by Mysid