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Pectoralis major - Wikipedia
Intercostal muscles - Wikipedia
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Muscles of the Pectoral Region - Major - Minor - TeachMeAnatomy
Pectoralis minor muscle: Origin, insertion and action
File:Pectoral girdles-zh.svg - Wikimedia Commons
Petoral Facebook, Instagram & Twitter on PeekYou
File:1118 Muscles that Position the Pectoral Girdle posterior.png
What are the pectoralis major and pectoralis minor muscles? - Quora
Pektor Facebook, Instagram & Twitter on PeekYou
Naming Skeletal Muscles – Anatomy & Physiology
2 Easy Ways to Bounce Pecs (with Pictures) - wikiHow