Source google image: https://image.slidesharecdn.com/musclesofthepectoralregion-091209103536-phpapp01/95/muscles-of-the-pectoral-region-2-728.jpg?cb=1260354956
Muscle pectoral
Source google image: https://image.slidesharecdn.com/musclesofthepectoralregion-091209103536-phpapp01/95/muscles-of-the-pectoral-region-2-728.jpg?cb=1260354956