@travxflex: Pectoralis major One muscle three parts Costal head of your Pectoralis major Actions-Extension (when humerus is flexed), Adduction, Horizontal Adduction, Internal Rotation. Origin- Anterior layer of Rectus Sheath Insertion- Crest of greater tubercle of the humerus Innervation- Medial and Lateral Pectoral Nerves (C5-T1) Arterial Supply- Pectoral Branches of thoracoacromial artery, Preforating branches of tnternal thoracic artery, superior and lateral thoracic arteries. Learning a little bit of anatomy every day will help you become a better qualified trainer. If you enjoy this post & want to learn more. DM me to sit in on my class Friday at 2pm cst. I teach the anatomy portion at Show Up Fitness helping qualify trainers via our SUF-CPT Use my code Travis25 to save you money. https://showupfitness.uscreen.io/ Prehab Guys Code TRAVIS0 = 14 days free #nasm #nasmcpt #personaltrainer #pectoralismajor #education #nursing #physicaltherapy #pt#phisio #fyp